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lua/bugs
Roberto Ierusalimschy c06cc60946 BUG: 'gsub' may go wild when wrongly called without its third 
> argument and with a large subject.
2007-10-29 13:51:10 -02:00

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--[=[
** lua.stx / llex.c
Tue Dec 2 10:45:48 EDT 1997
>> BUG: "lastline" was not reset on function entry, so debug information
>> started only in the 2nd line of a function.
=================================================================
--- Version 3.1 alpha
** lua.c
Thu Jan 15 14:34:58 EDT 1998
>> must include "stdlib.h" (for "exit()").
** lbuiltin.c / lobject.h
Thu Jan 15 14:34:58 EDT 1998
>> MAX_WORD may be bigger than MAX_INT
(by lhf)
** llex.c
Mon Jan 19 18:17:18 EDT 1998
>> wrong line number (+1) in error report when file starts with "#..."
** lstrlib.c
Tue Jan 27 15:27:49 EDT 1998
>> formats like "%020d" were considered too big (3 digits); moreover,
>> some sistems limit printf to at most 500 chars, so we can limit sizes
>> to 2 digits (99).
** lapi.c
Tue Jan 27 17:12:36 EDT 1998
>> "lua_getstring" may create a new string, so should check GC
** lstring.c / ltable.c
Wed Jan 28 14:48:12 EDT 1998
>> tables can become full of "empty" slots, and keep growing without limits.
** lstrlib.c
Mon Mar 9 15:26:09 EST 1998
>> gsub('a', '(b?)%1*' ...) loops (because the capture is empty).
** lstrlib.c
Mon May 18 19:20:00 EST 1998
>> arguments for "format" 'x', 'X', 'o' and 'u' must be unsigned int.
=================================================================
--- Version 3.1
** liolib.c / lauxlib.c
Mon Sep 7 15:57:02 EST 1998
>> function "luaL_argerror" prints wrong argument number (from a user's point
of view) when functions have upvalues.
** lstrlib.c
Tue Nov 10 17:29:36 EDT 1998
>> gsub/strfind do not check whether captures are properly finished.
(by roberto/tomas)
** lbuiltin.c
Fri Dec 18 11:22:55 EDT 1998
>> "tonumber" goes crazy with negative numbers in other bases (not 10),
because "strtol" returns long, not unsigned long.
(by Visual C++)
** lstrlib.c
Mon Jan 4 10:41:40 EDT 1999
>> "format" does not check size of format item (such as "%00000...00000d").
** lapi.c
Wed Feb 3 14:40:21 EDT 1999
>> getlocal cannot return the local itself, since lua_isstring and
lua_isnumber can modify it.
** lstrlib.c
Thu Feb 4 17:08:50 EDT 1999
>> format "%s" may break limit of "sprintf" on some machines.
(by Marcelo Sales)
** lzio.c
Thu Mar 4 11:49:37 EST 1999
>> file stream cannot call fread after EOF.
(by lhf)
=================================================================
--- Version 3.2 (beta)
** lstrlib.c
Fri Apr 30 11:10:20 EST 1999
>> '$' at end of pattern was matching regular '$', too.
(by anna; since 2.5)
** lbuiltin.c
Fri May 21 17:15:11 EST 1999
>> foreach, foreachi, foreachvar points to function in stack when stack
can be reallocated.
(by tomas; since 3.2 beta)
** lparser.c
Wed Jun 16 10:32:46 EST 1999
>> cannot assign to unlimited variables, because it causes overflow in
the number of returns of a function.
(since 3.1)
=================================================================
--- Version 3.2
** lmathlib.c
Wed Aug 18 11:28:38 EST 1999
>> random(0) and random(x,0) are wrong (0 is read as no argument!).
(by Dave Bollinger; since 3.1)
** lparser.c
Thu Sep 2 10:07:20 EST 1999
>> in the (old) expression << ls->fs->f->consts[checkname(ls)] >>, checkname
could realloc f->consts.
(by Supratik Champati; since 3.2 beta)
** lobject.c / lbuiltin.c
Wed Sep 8 17:41:54 EST 1999
>> tonumber'e1' and tonumber(' ', x), for x!=10, gave 0 instead of nil.
(since 3.1)
** lstrlib.c
Thu Nov 11 14:36:30 EDT 1999
>> `strfind' does not handle \0 in plain search.
(by Jon Kleiser; since 3.1)
** lparser.c
Wed Dec 29 16:05:43 EDT 1999
>> return gives wrong line in debug information
(by lhf; since 3.2 [at least])
** ldo.c
Thu Dec 30 16:39:33 EDT 1999
>> cannot reopen stdin (for binary mode)
(by lhf & roberto; since 3.1)
** lapi.c
Thu Mar 2 09:41:53 EST 2000
>> lua_settable should check stack space (it could call a T.M.)
(by lhf & celes; since 3.2; it was already fixed by fixed stack)
** lparser.c
Mon Apr 3 09:59:06 EST 2000
>> '%' should be in expfollow
(by Edgar Toernig; since 3.1; it was already fixed)
** lbuiltin.c
Mon Apr 3 10:05:05 EST 2000
>> tostring() without arguments gives seg. fault.
(by Edgar Toernig; since 3.0)
=================================================================
--- Version 4.0 alpha
Tested with full test suites (as locked in Mon Apr 24 14:23:11 EST 2000)
in the following platforms:
* Linux - gcc, g++
* AIX - gcc
* Solaris - gcc, cc
* IRIX - cc, cc-purify
* Windows - Visual C++ (.c e .cpp, warning level=4)
** lstrlib.c
Tue May 2 15:27:58 EST 2000
>> `strfind' gets wrong subject length when there is an offset
(by Jon Kleiser; since 4.0a)
** lparser.c
Fri May 12 15:11:12 EST 2000
>> first element in a list constructor is not adjusted to one value
>> (e.g. <20>a = {gsub('a','a','')}<7D>)
(by Tomas; since 4.0a)
** lparser.c
Wed May 24 14:50:16 EST 2000
>> record-constructor starting with an upvalue name gets an error
>> (e.g. <20>local a; function f() x = {a=1} end<6E>)
(by Edgar Toernig; since 3.1)
** lparser.c
Tue Aug 29 15:56:05 EST 2000
>> error message for `for' uses `while'
(since 4.0a; already corrected)
** lgc.c
Tue Aug 29 15:57:41 EST 2000
>> gc tag method for nil could call line hook
(by ry; since ?)
=================================================================
--- Version 4.0 Beta
** liolib.c
Fri Sep 22 15:12:37 EST 2000
>> `read("*w")' should return nil at EOF
(by roberto; since 4.0b)
** lvm.c
Mon Sep 25 11:47:48 EST 2000
>> lua_gettable does not get key from stack top
(by Philip Yi; since 4.0b)
** lgc.c
Mon Sep 25 11:50:48 EST 2000
>> GC may crash when checking locked C closures
(by Philip Yi; since 4.0b)
** lapi.c
Wed Sep 27 09:50:19 EST 2000
>> lua_tag should return LUA_NOTAG for non-valid indices
(by Paul Hankin; since 4.0b)
** llex.h / llex.c / lparser.c
Wed Sep 27 13:39:45 EST 2000
>> parser overwrites semantic information when looking ahead
>> (e.g. <20>a = {print'foo'}<7D>)
(by Edgar Toernig; since 4.0b, deriving from previous bug)
** liolib.c
Thu Oct 26 10:50:46 EDT 2000
>> in function `read_file', realloc() doesn't free the buffer if it can't
>> allocate new memory
(by Mauro Vezzosi; since 4.0b)
=================================================================
--- Version 4.0
** lparser.c
Wed Nov 29 09:51:44 EDT 2000
>> parser does not accept a `;' after a `return'
(by lhf; since 4.0b)
** liolib.c
Fri Dec 22 15:30:42 EDT 2000
>> when `read' fails it must return nil (and not no value)
(by cassino; since at least 3.1)
** lstring.c/lapi.c
Thu Feb 1 11:55:45 EDT 2001
>> lua_pushuserdata(L, NULL) is buggy
(by Edgar Toernig; since 4.0)
** ldo.c
Fri Feb 2 14:06:40 EDT 2001
>> <20>while 1 dostring[[print('hello\n')]] end<6E> never reclaims memory
(by Andrew Paton; since 4.0b)
** lbaselib.c
Tue Feb 6 11:57:13 EDT 2001
>> ESC (which starts precompiled code) in C is \33, not \27
(by Edgar Toernig and lhf; since 4.0b)
** lparser.c
Tue Jul 10 16:59:18 EST 2001
>> error message for `%a' gave wrong line number
(by Leonardo Constantino; since 4.0)
** lbaselib.c
Fri Dec 21 15:21:05 EDT 2001
>> seg. fault when rawget/rawset get extra arguments
(by Eric Mauger; since 4.0b)
** lvm.c
Wed Jun 19 13:28:20 EST 2002
>> line hook gets wrong `ar'
(by Daniel C. Sinclair; since 4.0.b)
** ldo.c
Wed Jun 19 13:31:49 EST 2002
>> `protectedparser' may run GC, and then collect `filename'
>> (in function `parse_file')
(by Alex Bilyk; since 4.0)
=================================================================
--- Version 5.0 alpha
** lgc.c
Fri Aug 30 13:49:14 EST 2002
>> GC metamethod stored in a weak metatable being collected together with
>> userdata may not be cleared properly
(by Roberto; since 5.0a)
** lapi.c
Thu Nov 21 11:00:00 EST 2002
>> ULONG_MAX>>10 may not fit into an int
(by Jeff Petkau; since 4.0)
** lparser.c
Fri Dec 6 17:06:40 UTC 2002
>> scope of generic for variables is not sound
(by Gavin Wraith; since 5.0a)
=================================================================
--- Version 5.0 beta
** lbaselib.c
Fri Dec 20 09:53:19 UTC 2002
>> `resume' was checking the wrong value for stack overflow
(by Maik Zimmermann; since 5.0b)
** ldo.c
Thu Jan 23 11:29:06 UTC 2003
>> error during garbage collection in luaD_protectedparser is not being
>> protected
(by Benoit Germain; since 5.0a)
** ldo.c (and others)
Fri Feb 28 14:20:33 EST 2003
>> GC metamethod calls could mess C/Lua stack syncronization
(by Roberto; since 5.0b)
** lzio.h/zlio.c
Thu Mar 20 11:40:12 EST 2003
>> zio mixes a 255 as first char in a buffer with EOZ
(by lhf; since 5.0a)
--]=]
-----------------------------------------------------------------
-- Lua 5.0 (final)
Bug{
what = [[lua_closethread exists only in the manual]],
report = [[by Nguyen Binh, 28/04/2003]],
patch = [[no patch; the manual is wrong]],
}
Bug{
what = [[attempt to resume a running coroutine crashes Lua]],
example = [[
function co_func (current_co)
coroutine.resume(co)
end
co = coroutine.create(co_func)
coroutine.resume(co)
coroutine.resume(co) --> seg. fault
]],
report = [[by Alex Bilyk, 09/05/2003]],
patch = [[
* ldo.c:
325,326c325
< if (nargs >= L->top - L->base)
< luaG_runerror(L, "cannot resume dead coroutine");
---
> lua_assert(nargs < L->top - L->base);
329c328,329
< else if (ci->state & CI_YIELD) { /* inside a yield? */
---
> else { /* inside a yield */
> lua_assert(ci->state & CI_YIELD);
344,345d343
< else
< luaG_runerror(L, "cannot resume non-suspended coroutine");
351a350,358
> static int resume_error (lua_State *L, const char *msg) {
> L->top = L->ci->base;
> setsvalue2s(L->top, luaS_new(L, msg));
> incr_top(L);
> lua_unlock(L);
> return LUA_ERRRUN;
> }
>
>
355a363,368
> if (L->ci == L->base_ci) {
> if (nargs >= L->top - L->base)
> return resume_error(L, "cannot resume dead coroutine");
> }
> else if (!(L->ci->state & CI_YIELD)) /* not inside a yield? */
> return resume_error(L, "cannot resume non-suspended coroutine");
]],
}
Bug{
what = [[file:close cannot be called without a file. (results in seg fault)]],
example = [[
> io.stdin.close() -- correct call shold be io.stdin:close()
]],
report = [[by Tuomo Valkonen, 27/05/2003]],
patch = [[
* liolib.c:
161c161
< if (lua_isnone(L, 1)) {
---
> if (lua_isnone(L, 1) && lua_type(L, lua_upvalueindex(1)) == LUA_TTABLE) {
]], --}}
}
Bug{
what = [[C functions also may have stacks larger than current top]],
example = [[
Must recompile lua with a change in lua.c and with lua_assert defined:
* lua.c:
381a382
> lua_checkstack(l, 1000);
]],
report = [[Alex Bilyk, 09/06/2003]],
patch = [[
* lgc.c:
247c247
< if (!(ci->state & CI_C) && lim < ci->top)
---
> if (lim < ci->top)
]],
}
Bug{
what = [[`pc' address is invalidated when a coroutine is suspended]],
example = [[
function g(x)
coroutine.yield(x)
end
function f (i)
debug.sethook(print, "l")
for j=1,1000 do
g(i+j)
end
end
co = coroutine.wrap(f)
co(10)
pcall(co)
pcall(co)
]],
report = [[Nick Trout, 07/07/2003]],
patch = [[
* lvm.c:
402,403c402,403
< L->ci->u.l.pc = &pc;
< if (L->hookmask & LUA_MASKCALL)
---
> if (L->hookmask & LUA_MASKCALL) {
> L->ci->u.l.pc = &pc;
404a405
> }
405a407
> L->ci->u.l.pc = &pc;
676,678c678
< lua_assert(ci->u.l.pc == &pc &&
< ttisfunction(ci->base - 1) &&
< (ci->state & CI_SAVEDPC));
---
> lua_assert(ttisfunction(ci->base - 1) && (ci->state & CI_SAVEDPC));
]]
}
Bug{
what = [[userdata to be collected still counts into new GC threshold,
increasing memory consumption]],
report = [[Roberto, 25/07/2003]],
example = [[
a = newproxy(true)
getmetatable(a).__gc = function () end
for i=1,10000000 do
newproxy(a)
if math.mod(i, 10000) == 0 then print(gcinfo()) end
end
]],
patch = [[
* lgc.h:
18c18
< void luaC_separateudata (lua_State *L);
---
> size_t luaC_separateudata (lua_State *L);
* lgc.c:
113c113,114
< void luaC_separateudata (lua_State *L) {
---
> size_t luaC_separateudata (lua_State *L) {
> size_t deadmem = 0;
127a129
> deadmem += sizeudata(gcotou(curr)->uv.len);
136a139
> return deadmem;
390c393
< static void checkSizes (lua_State *L) {
---
> static void checkSizes (lua_State *L, size_t deadmem) {
400c403
< G(L)->GCthreshold = 2*G(L)->nblocks; /* new threshold */
---
> G(L)->GCthreshold = 2*G(L)->nblocks - deadmem; /* new threshold */
454c457,458
< static void mark (lua_State *L) {
---
> static size_t mark (lua_State *L) {
> size_t deadmem;
467c471
< luaC_separateudata(L); /* separate userdata to be preserved */
---
> deadmem = luaC_separateudata(L); /* separate userdata to be preserved */
475a480
> return deadmem;
480c485
< mark(L);
---
> size_t deadmem = mark(L);
482c487
< checkSizes(L);
---
> checkSizes(L, deadmem);
]]
}
Bug{
what=[[IBM AS400 (OS400) has sizeof(void *)==16, and a `%p' may generate
up to 60 characters in a `printf'. That causes a buffer overflow in
`tostring'.]],
report = [[David Burgess, 25/08/2003]],
example = [[print{}; (in an AS400 machine)]],
patch = [[
* liolib.c:
178c178
< char buff[32];
---
> char buff[128];
* lbaselib.c:
327c327
< char buff[64];
---
> char buff[128];
]]
}
Bug{
what = [[syntax `local function' does not increment stack size]],
report = [[Rici Lake, 26/09/2003]],
example = [[
-- must run this with precompiled code
local a,b,c
local function d () end
]],
patch = [[
* lparser.c:
1143a1144
> FuncState *fs = ls->fs;
1145c1146,1147
< init_exp(&v, VLOCAL, ls->fs->freereg++);
---
> init_exp(&v, VLOCAL, fs->freereg);
> luaK_reserveregs(fs, 1);
1148c1150,1152
< luaK_storevar(ls->fs, &v, &b);
---
> luaK_storevar(fs, &v, &b);
> /* debug information will only see the variable after this point! */
> getlocvar(fs, fs->nactvar - 1).startpc = fs->pc;
]],
}
Bug{
what = [[count hook may be called without being set]],
report = [[Andreas Stenius, 06/10/2003]],
example = [[
set your hooks with
lua_sethook(L, my_hook, LUA_MASKLINE | LUA_MASKRET, 1);
(It is weird to use a count > 0 without setting the count hook,
but it is not wrong.)
]],
patch = [[
* lvm.c:
69c69
< if (mask > LUA_MASKLINE) { /* instruction-hook set? */
---
> if (mask & LUA_MASKCOUNT) { /* instruction-hook set? */
]],
}
Bug{
what = [[`dofile' eats one return value when called without arguments]],
report = [[Frederico Abraham, 15/01/2004]],
example = [[
a,b = dofile() --< here you enter `return 1,2,3 <eof>'
print(a,b) --> 2 3 (should be 1 and 2)
]],
patch = [[
* lbaselib.c:
313a314
> int n = lua_gettop(L);
317c318
< return lua_gettop(L) - 1;
---
> return lua_gettop(L) - n;
]],
}
-----------------------------------------------------------------
-- Lua 5.0.2
Bug{
what = [[string concatenation may cause arithmetic overflow, leading
to a buffer overflow]],
report = [[Rici Lake, 20/05/2004]],
example = [[
longs = string.rep("\0", 2^25)
function catter(i)
return assert(loadstring(
string.format("return function(a) return a%s end",
string.rep("..a", i-1))))()
end
rep129 = catter(129)
rep129(longs)
]],
patch = [[
* lvm.c:
@@ -321,15 +321,15 @@
luaG_concaterror(L, top-2, top-1);
} else if (tsvalue(top-1)->tsv.len > 0) { /* if len=0, do nothing */
/* at least two string values; get as many as possible */
- lu_mem tl = cast(lu_mem, tsvalue(top-1)->tsv.len) +
- cast(lu_mem, tsvalue(top-2)->tsv.len);
+ size_t tl = tsvalue(top-1)->tsv.len;
char *buffer;
int i;
- while (n < total && tostring(L, top-n-1)) { /* collect total length */
- tl += tsvalue(top-n-1)->tsv.len;
- n++;
+ /* collect total length */
+ for (n = 1; n < total && tostring(L, top-n-1); n++) {
+ size_t l = tsvalue(top-n-1)->tsv.len;
+ if (l >= MAX_SIZET - tl) luaG_runerror(L, "string length overflow");
+ tl += l;
}
- if (tl > MAX_SIZET) luaG_runerror(L, "string size overflow");
buffer = luaZ_openspace(L, &G(L)->buff, tl);
tl = 0;
for (i=n; i>0; i--) { /* concat all strings */
]]
}
Bug{
what = [[lua_getupvalue and setupvalue do not check for index too small]],
report = [[Mike Pall, ?/2004]],
example = [[debug.getupvalue(function() end, 0)]],
patch = [[
* lapi.c
941c941
< if (n > f->c.nupvalues) return NULL;
---
> if (!(1 <= n && n <= f->c.nupvalues)) return NULL;
947c947
< if (n > p->sizeupvalues) return NULL;
---
> if (!(1 <= n && n <= p->sizeupvalues)) return NULL;
]]
}
Bug{
what = [[values holded in open upvalues of suspended threads may be
incorrectly collected]],
report = [[Spencer Schumann, 31/12/2004]],
example = [[
local thread_id = 0
local threads = {}
function fn(thread)
thread_id = thread_id + 1
threads[thread_id] = function()
thread = nil
end
coroutine.yield()
end
while true do
local thread = coroutine.create(fn)
coroutine.resume(thread, thread)
end
]],
patch = [[
* lgc.c:
221,224c221,222
< if (!u->marked) {
< markobject(st, &u->value);
< u->marked = 1;
< }
---
> markobject(st, u->v);
> u->marked = 1;
]],
}
Bug{
what = [[rawset/rawget do not ignore extra arguments]],
report = [[Romulo Bahiense, 11/03/2005]],
example = [[
a = {}
rawset(a, 1, 2, 3)
print(a[1], a[2]) -- should be 2 and nil
]],
patch = [[
* lbaselib.c:
175a176
> lua_settop(L, 2);
183a185
> lua_settop(L, 3);
]],
}
Bug{
what = [[weak tables that survive one collection are never collected]],
report = [[Chromix, 02/01/2006]],
example = [[
a = {}
print(gcinfo())
for i = 1, 10000 do
a[i] = setmetatable({}, {__mode = "v"})
end
collectgarbage()
a = nil
collectgarbage()
print(gcinfo())
]],
patch = [[
* lgc.c
@@ -366,7 +366,7 @@
GCObject *curr;
int count = 0; /* number of collected items */
while ((curr = *p) != NULL) {
- if (curr->gch.marked > limit) {
+ if ((curr->gch.marked & ~(KEYWEAK | VALUEWEAK)) > limit) {
unmark(curr);
p = &curr->gch.next;
}
]],
}
Bug{
what = [[Some "not not exp" may not result in boolean values]],
report = [[]],
since = [[4.0]],
example = [[
-- should print false, but prints nil
print(not not (nil and 4))
]],
patch = [[]],
}
Bug{
what = [[On some machines, closing a "piped file" (created with io.popen)
may crash Lua]],
report = [[]],
since = [[5.0]],
example = [[
-- only on some machines
f = io.popen("ls")
f:close()
]],
patch = [[]],
}
-----------------------------------------------------------------
-- Lua 5.1
Bug{
what = [[In 16-bit machines, expressions and/or with numeric constants as the
right operand may result in weird values]],
report = [[Andreas Stenius/Kein-Hong Man, 15/03/2006]],
example = [[
print(false or 0) -- on 16-bit machines
]],
patch = [[
* lcode.c:
@@ -731,17 +731,15 @@
case OPR_AND: {
lua_assert(e1->t == NO_JUMP); /* list must be closed */
luaK_dischargevars(fs, e2);
- luaK_concat(fs, &e1->f, e2->f);
- e1->k = e2->k; e1->u.s.info = e2->u.s.info;
- e1->u.s.aux = e2->u.s.aux; e1->t = e2->t;
+ luaK_concat(fs, &e2->f, e1->f);
+ *e1 = *e2;
break;
}
case OPR_OR: {
lua_assert(e1->f == NO_JUMP); /* list must be closed */
luaK_dischargevars(fs, e2);
- luaK_concat(fs, &e1->t, e2->t);
- e1->k = e2->k; e1->u.s.info = e2->u.s.info;
- e1->u.s.aux = e2->u.s.aux; e1->f = e2->f;
+ luaK_concat(fs, &e2->t, e1->t);
+ *e1 = *e2;
break;
}
]],
}
Bug{
what = [[luaL_checkudata may produce wrong error message]],
report = [[Greg Falcon, 21/03/2006]],
example = [[
getmetatable(io.stdin).__gc()
--> bad argument #1 to '__gc' (FILE* expected, got table)
]],
patch = [[
* lauxlib.c:
@@ -123,11 +123,17 @@
LUALIB_API void *luaL_checkudata (lua_State *L, int ud, const char *tname) {
void *p = lua_touserdata(L, ud);
- lua_getfield(L, LUA_REGISTRYINDEX, tname); /* get correct metatable */
- if (p == NULL || !lua_getmetatable(L, ud) || !lua_rawequal(L, -1, -2))
- luaL_typerror(L, ud, tname);
- lua_pop(L, 2); /* remove both metatables */
- return p;
+ if (p != NULL) { /* value is a userdata? */
+ if (lua_getmetatable(L, ud)) { /* does it have a metatable? */
+ lua_getfield(L, LUA_REGISTRYINDEX, tname); /* get correct metatable */
+ if (lua_rawequal(L, -1, -2)) { /* does it have the correct mt? */
+ lua_pop(L, 2); /* remove both metatables */
+ return p;
+ }
+ }
+ }
+ luaL_typerror(L, ud, tname); /* else error */
+ return NULL; /* to avoid warnings */
}
]]
}
Bug{
what = [[
In Windows,
when Lua is used in an application that also uses DirectX,
it may present an erractic behavior.
THIS IS NOT A LUA BUG!
The problem is that DirectX violates an ABI that Lua depends on.]],
patch = [[
The simplest solution is to use DirectX with
the D3DCREATE_FPU_PRESERVE flag.
Otherwise, you can change the definition of lua_number2int,
in luaconf.h, to this one:
#define lua_number2int(i,d) __asm fld d __asm fistp i
]],
}
Bug{
what = [[option '%q' in string.format does not handle '\r' correctly.]],
example = [[
local s = "a string with \r and \n and \r\n and \n\r"
local c = string.format("return %q", s)
assert(assert(loadstring(c))() == s)
]],
patch = [[
* lstrlib.c:
@@ -703,6 +703,10 @@
luaL_addchar(b, *s);
break;
}
+ case '\r': {
+ luaL_addlstring(b, "\\r", 2);
+ break;
+ }
case '\0': {
luaL_addlstring(b, "\\000", 4);
break;
]],
}
Bug{
what = [[lua_dostring/lua_dofile should return any values returned
by the chunk]],
patch = [[
* lauxlib.h:
@@ -108,9 +108,11 @@
#define luaL_typename(L,i) lua_typename(L, lua_type(L,(i)))
-#define luaL_dofile(L, fn) (luaL_loadfile(L, fn) || lua_pcall(L, 0, 0, 0))
+#define luaL_dofile(L, fn) \
+ (luaL_loadfile(L, fn) || lua_pcall(L, 0, LUA_MULTRET, 0))
-#define luaL_dostring(L, s) (luaL_loadstring(L, s) || lua_pcall(L, 0, 0, 0))+#define luaL_dostring(L, s) \
+ (luaL_loadstring(L, s) || lua_pcall(L, 0, LUA_MULTRET, 0))
#define luaL_getmetatable(L,n) (lua_getfield(L, LUA_REGISTRYINDEX, (n)))
]],
}
Bug{
what = [[garbage collector does not compensate enough for finalizers]],
patch = [[
lgc.c:
@@ -322,4 +322,6 @@
-static void propagateall (global_State *g) {
- while (g->gray) propagatemark(g);
+static size_t propagateall (global_State *g) {
+ size_t m = 0;
+ while (g->gray) m += propagatemark(g);
+ return m;
}
@@ -542,3 +544,3 @@
marktmu(g); /* mark `preserved' userdata */
- propagateall(g); /* remark, to propagate `preserveness' */
+ udsize += propagateall(g); /* remark, to propagate `preserveness' */
cleartable(g->weak); /* remove collected objects from weak tables */
@@ -592,2 +594,4 @@
GCTM(L);
+ if (g->estimate > GCFINALIZECOST)
+ g->estimate -= GCFINALIZECOST;
]]
}
But{
what = [[debug hooks may get wrong when mixed with coroutines]],
report = [[by Ivko Stanilov, 03/06/2006]],
example = [[
co = coroutine.create(function (a,b)
coroutine.yield(a, b)
return b, "end"
end)
debug.sethook(co, function() end, "lcr")
coroutine.resume(co, 100, 2000)
coroutine.resume(co, 100, 2000)
]],
patch = [[
* ldo.c:
@@ -389,6 +389,7 @@
return;
}
else { /* resuming from previous yield */
+ L->status = 0;
if (!f_isLua(ci)) { /* `common' yield? */
/* finish interrupted execution of `OP_CALL' */
lua_assert(GET_OPCODE(*((ci-1)->savedpc - 1)) == OP_CALL ||
@@ -399,7 +400,6 @@
else /* yielded inside a hook: just continue its execution */
L->base = L->ci->base;
}
- L->status = 0;
luaV_execute(L, cast_int(L->ci - L->base_ci));
}
]],
}
-----------------------------------------------------------------
-- Lua 5.1.1
Bug{
what = [[list constructors have wrong limit]],
report = [[by Norman Ramsey, June 2006]],
since = "Lua 5.1",
example = [[
a = {}
a[1] = "x={1"
for i = 2, 2^20 do
a[i] = 1
end
a[#a + 1] = "}"
s = table.concat(a, ",")
assert(loadstring(s))()
print(#x)
]],
patch = [[
* lparser.c:
@@ -489,7 +489,7 @@
static void listfield (LexState *ls, struct ConsControl *cc) {
expr(ls, &cc->v);
- luaY_checklimit(ls->fs, cc->na, MAXARG_Bx, "items in a constructor");
+ luaY_checklimit(ls->fs, cc->na, MAX_INT, "items in a constructor");
cc->na++;
cc->tostore++;
}
]],
}
Bug{
what = [[wrong message error in some cases involving closures]],
report = [[Shmuel Zeigerman, on 07/2006]],
since = "Lua 5.1",
example = [[
local Var
local function main()
NoSuchName (function() Var=0 end)
end
main()
--> lua5.1: temp:3: attempt to call upvalue 'Var' (a nil value)
]],
patch = [[
*ldebug.c:
@@ -435,14 +435,16 @@
break;
}
case OP_CLOSURE: {
- int nup;
+ int nup, j;
check(b < pt->sizep);
nup = pt->p[b]->nups;
check(pc + nup < pt->sizecode);
- for (; nup>0; nup--) {
- OpCode op1 = GET_OPCODE(pt->code[pc+nup]);
+ for (j = 1; j <= nup; j++) {
+ OpCode op1 = GET_OPCODE(pt->code[pc + j]);
check(op1 == OP_GETUPVAL || op1 == OP_MOVE);
}
+ if (reg != NO_REG) /* tracing? */
+ pc += nup; /* do not 'execute' these pseudo-instructions */
break;
}
case OP_VARARG: {
]],
}
Bug{
what = [[string.format("%") may read past the string]],
report = [[Roberto, on 09/2006]],
since = [[5.0 (at least)]],
example = [[print(string.format("%"))]],
patch = [[
*lstrlib.c:
@@ -723,7 +723,7 @@
static const char *scanformat (lua_State *L, const char *strfrmt, char *form) { const char *p = strfrmt;
- while (strchr(FLAGS, *p)) p++; /* skip flags */
+ while (*p != '\0' && strchr(FLAGS, *p) != NULL) p++; /* skip flags */
if ((size_t)(p - strfrmt) >= sizeof(FLAGS))
luaL_error(L, "invalid format (repeated flags)");
if (isdigit(uchar(*p))) p++; /* skip width */
]],
}
Bug{
what = [[os.date throws an error when result is the empty string]],
report = [[]],
since = [[4.0]],
example = [[print(os.date(""))]],
patch = [[
*loslib.c:
@@ -148,7 +148,18 @@
else {
- char b[256];
- if (strftime(b, sizeof(b), s, stm))
- lua_pushstring(L, b);
- else
- return luaL_error(L, LUA_QL("date") " format too long");
+ char cc[3];
+ luaL_Buffer b;
+ cc[0] = '%'; cc[2] = '\0';
+ luaL_buffinit(L, &b);
+ for (; *s; s++) {
+ if (*s != '%' || *(s + 1) == '\0') /* no conversion specifier? */
+ luaL_addchar(&b, *s);
+ else {
+ size_t reslen;
+ char buff[200]; /* should be big enough for any conversion result */
+ cc[1] = *(++s);
+ reslen = strftime(buff, sizeof(buff), cc, stm);
+ luaL_addlstring(&b, buff, reslen);
+ }
+ }
+ luaL_pushresult(&b);
}
]],
}
Bug{
what = [[setfenv accepts invalid 1st argument]],
report = [[Doug Rogers, on 02/2007]],
since = [[5.0]],
example = [[setfenv(nil, {}) -- should throw an error]],
patch = [[
*lbaselib.c:
@@ -116,3 +116,3 @@
-static void getfunc (lua_State *L) {
+static void getfunc (lua_State *L, int opt) {
if (lua_isfunction(L, 1)) lua_pushvalue(L, 1);
@@ -120,3 +120,3 @@
lua_Debug ar;
- int level = luaL_optint(L, 1, 1);
+ int level = opt ? luaL_optint(L, 1, 1) : luaL_checkint(L, 1);
luaL_argcheck(L, level >= 0, 1, "level must be non-negative");
@@ -133,3 +133,3 @@
static int luaB_getfenv (lua_State *L) {
- getfunc(L);
+ getfunc(L, 1);
if (lua_iscfunction(L, -1)) /* is a C function? */
@@ -144,3 +144,3 @@
luaL_checktype(L, 2, LUA_TTABLE);
- getfunc(L);
+ getfunc(L, 0);
lua_pushvalue(L, 2);
]],
}
Bug{
what = [[wrong code for arithmetic expressions in some specific scenarios]],
report = [[Thierry Grellier, on 01/2007]],
since = [[5.1]],
example = [[
-- use a large number of names (almost 256)
v1=1; v2=1; v3=1; v4=1; v5=1; v6=1; v7=1; v8=1; v9=1;
v10=1; v11=1; v12=1; v13=1; v14=1; v15=1; v16=1; v17=1;
v18=1; v19=1; v20=1; v21=1; v22=1; v23=1; v24=1; v25=1;
v26=1; v27=1; v28=1; v29=1; v30=1; v31=1; v32=1; v33=1;
v34=1; v35=1; v36=1; v37=1; v38=1; v39=1; v40=1; v41=1;
v42=1; v43=1; v44=1; v45=1; v46=1; v47=1; v48=1; v49=1;
v50=1; v51=1; v52=1; v53=1; v54=1; v55=1; v56=1; v57=1;
v58=1; v59=1; v60=1; v61=1; v62=1; v63=1; v64=1; v65=1;
v66=1; v67=1; v68=1; v69=1; v70=1; v71=1; v72=1; v73=1;
v74=1; v75=1; v76=1; v77=1; v78=1; v79=1; v80=1; v81=1;
v82=1; v83=1; v84=1; v85=1; v86=1; v87=1; v88=1; v89=1;
v90=1; v91=1; v92=1; v93=1; v94=1; v95=1; v96=1; v97=1;
v98=1; v99=1; v100=1; v101=1; v102=1; v103=1; v104=1; v105=1;
v106=1; v107=1; v108=1; v109=1; v110=1; v111=1; v112=1; v113=1;
v114=1; v115=1; v116=1; v117=1; v118=1; v119=1; v120=1; v121=1;
v122=1; v123=1; v124=1; v125=1; v126=1; v127=1; v128=1; v129=1;
v130=1; v131=1; v132=1; v133=1; v134=1; v135=1; v136=1; v137=1;
v138=1; v139=1; v140=1; v141=1; v142=1; v143=1; v144=1; v145=1;
v146=1; v147=1; v148=1; v149=1; v150=1; v151=1; v152=1; v153=1;
v154=1; v155=1; v156=1; v157=1; v158=1; v159=1; v160=1; v161=1;
v162=1; v163=1; v164=1; v165=1; v166=1; v167=1; v168=1; v169=1;
v170=1; v171=1; v172=1; v173=1; v174=1; v175=1; v176=1; v177=1;
v178=1; v179=1; v180=1; v181=1; v182=1; v183=1; v184=1; v185=1;
v186=1; v187=1; v188=1; v189=1; v190=1; v191=1; v192=1; v193=1;
v194=1; v195=1; v196=1; v197=1; v198=1; v199=1; v200=1; v201=1;
v202=1; v203=1; v204=1; v205=1; v206=1; v207=1; v208=1; v209=1;
v210=1; v211=1; v212=1; v213=1; v214=1; v215=1; v216=1; v217=1;
v218=1; v219=1; v220=1; v221=1; v222=1; v223=1; v224=1; v225=1;
v226=1; v227=1; v228=1; v229=1; v230=1; v231=1; v232=1; v233=1;
v234=1; v235=1; v236=1; v237=1; v238=1; v239=1; v240=1; v241=1;
v242=1; v243=1; v244=1; v245=1; v246=1; v247=1; v248=1; v249=1;
v250=1;
v251={k1 = 1};
v252=1;
print(2 * v251.k1, v251.k1 * 2); -- 2 2, OK
v253=1;
print(2 * v251.k1, v251.k1 * 2); -- 1 2, ???
]],
patch = [[
*lcode.c:
@@ -657,10 +657,16 @@
if (constfolding(op, e1, e2))
return;
else {
- int o1 = luaK_exp2RK(fs, e1);
int o2 = (op != OP_UNM && op != OP_LEN) ? luaK_exp2RK(fs, e2) : 0;
- freeexp(fs, e2);
- freeexp(fs, e1);
+ int o1 = luaK_exp2RK(fs, e1);
+ if (o1 > o2) {
+ freeexp(fs, e1);
+ freeexp(fs, e2);
+ }
+ else {
+ freeexp(fs, e2);
+ freeexp(fs, e1);
+ }
e1->u.s.info = luaK_codeABC(fs, op, 0, o1, o2);
e1->k = VRELOCABLE;
}
@@ -718,10 +724,15 @@
luaK_exp2nextreg(fs, v); /* operand must be on the `stack' */
break;
}
- default: {
+ case OPR_ADD: case OPR_SUB: case OPR_MUL: case OPR_DIV:
+ case OPR_MOD: case OPR_POW: {
if (!isnumeral(v)) luaK_exp2RK(fs, v);
break;
}
+ default: {
+ luaK_exp2RK(fs, v);
+ break;
+ }
}
}
]],
}
Bug{
what = [[assignment of nil to parameter may be optimized away]],
report = [[Thomas Lauer, on 03/2007]],
since = [[5.1]],
example = [[
function f (a)
a=nil
return a
end
print(f("test"))
]],
patch = [[
*lcode.c:
@@ -35,16 +35,20 @@
void luaK_nil (FuncState *fs, int from, int n) {
Instruction *previous;
if (fs->pc > fs->lasttarget) { /* no jumps to current position? */
- if (fs->pc == 0) /* function start? */
- return; /* positions are already clean */
- previous = &fs->f->code[fs->pc-1];
- if (GET_OPCODE(*previous) == OP_LOADNIL) {
- int pfrom = GETARG_A(*previous);
- int pto = GETARG_B(*previous);
- if (pfrom <= from && from <= pto+1) { /* can connect both? */
- if (from+n-1 > pto)
- SETARG_B(*previous, from+n-1);
- return;
+ if (fs->pc == 0) { /* function start? */
+ if (from >= fs->nactvar)
+ return; /* positions are already clean */
+ }
+ else {
+ previous = &fs->f->code[fs->pc-1];
+ if (GET_OPCODE(*previous) == OP_LOADNIL) {
+ int pfrom = GETARG_A(*previous);
+ int pto = GETARG_B(*previous);
+ if (pfrom <= from && from <= pto+1) { /* can connect both? */
+ if (from+n-1 > pto)
+ SETARG_B(*previous, from+n-1);
+ return;
+ }
}
}
}
]],
}
Bug{
what = [[__concat metamethod converts numbers to strings]],
report = [[Paul Winwood, on 12/2006]],
since = [[5.0]],
example = [[
a = {}
setmetatable(a, {__concat = function (a,b) print(type(a), type(b)) end})
a = 4 .. a
]],
patch = [[
*lvm.c:
@@ -281,10 +281,12 @@
do {
StkId top = L->base + last + 1;
int n = 2; /* number of elements handled in this pass (at least 2) */
- if (!tostring(L, top-2) || !tostring(L, top-1)) {
+ if (!(ttisstring(top-2) || ttisnumber(top-2)) || !tostring(L, top-1)) {
if (!call_binTM(L, top-2, top-1, top-2, TM_CONCAT))
luaG_concaterror(L, top-2, top-1);
- } else if (tsvalue(top-1)->len > 0) { /* if len=0, do nothing */
+ } else if (tsvalue(top-1)->len == 0) /* second op is empty? */
+ (void)tostring(L, top - 2); /* result is first op (as string) */
+ else {
/* at least two string values; get as many as possible */
size_t tl = tsvalue(top-1)->len;
char *buffer;
]],
}
Bug{
what = [[As a library, loadlib.c should not access Lua internals
(via lobject.h)]],
report = [[J<>r<EFBFBD>me Vuarand, on 03/2007]],
since = [[5.0 (at least)]],
example = [[the bug has no effect on external behavior]],
patch = [[remove the '#include "lobject.h" and use
'lua_pushfstring' instead of 'luaO_pushfstring']],
}
-----------------------------------------------------------------
-- Lua 5.1.2
Bug{
what = [[Lua may close standard files,
which then may be used by C]],
report = [[David Manura/Ross Berteig, on 04/2007]],
since = [[ ]],
example = [[
io.close(io.stderr)
-- in some systems, following attempts to write to 'stderr' may crash
a = a + 1
]],
patch = [[
]],
}
Bug{
what = [[code generated for "-nil", "-true", and "-false" is wrong]],
report = [[David Manura/Rici Lake, on 04/2007]],
since = [[5.1]],
example = [[print(-nil)]],
patch = [[
lcode.c:
@@ -699,7 +699,7 @@
e2.t = e2.f = NO_JUMP; e2.k = VKNUM; e2.u.nval = 0;
switch (op) {
case OPR_MINUS: {
- if (e->k == VK)
+ if (!isnumeral(e))
luaK_exp2anyreg(fs, e); /* cannot operate on non-numeric constants */
codearith(fs, OP_UNM, e, &e2);
break;
]],
}
Bug{
what = [[Count hook may be called without being set.]],
report = [[Mike Pall, on 05/2007]],
since = [[?]],
example = [[ ]],
patch = [[
lvm.c:
@@ -61,11 +61,9 @@
lu_byte mask = L->hookmask;
const Instruction *oldpc = L->savedpc;
L->savedpc = pc;
- if (mask > LUA_MASKLINE) { /* instruction-hook set? */
- if (L->hookcount == 0) {
- resethookcount(L);
- luaD_callhook(L, LUA_HOOKCOUNT, -1);
- }
+ if ((mask & LUA_MASKCOUNT) && L->hookcount == 0) {
+ resethookcount(L);
+ luaD_callhook(L, LUA_HOOKCOUNT, -1);
}
if (mask & LUA_MASKLINE) {
Proto *p = ci_func(L->ci)->l.p;
]],
}
Bug{
what = [[recursive coroutines may overflow C stack]],
report = [[ , on ]],
since = [[5.0]],
example = [[
a = function(a) coroutine.wrap(a)(a) end
a(a)
]],
patch = [[The 'nCcalls' counter should be shared by all threads.
(That is, it should be declared in the 'global_State' structure,
not in 'lua_State'.)
]],
}
Bug{
what = [[wrong error message in some concatenations]],
report = [[Alex Davies, on 05/2007]],
since = [[5.1.2]],
example = [[a = nil; a = (1)..a]],
patch = [[
ldebug.c:
@@ -563,8 +563,8 @@
void luaG_concaterror (lua_State *L, StkId p1, StkId p2) {
- if (ttisstring(p1)) p1 = p2;
- lua_assert(!ttisstring(p1));
+ if (ttisstring(p1) || ttisnumber(p1)) p1 = p2;
+ lua_assert(!ttisstring(p1) && !ttisnumber(p1));
luaG_typeerror(L, p1, "concatenate");
}
]],
}
Bug{
what = [[Very small numbers all collide in the hash function.
(This creates only performance problems; the behavoir is correct.)]],
report = [[, on ]],
since = [[Lua 5.0]],
example = [[ ]],
patch = [[
ltable.c:
87,88c87,88
< n += 1; /* normalize number (avoid -0) */
< lua_assert(sizeof(a) <= sizeof(n));
---
> if (luai_numeq(n, 0)) /* avoid problems with -0 */
> return gnode(t, 0);
]],
}
Bug{
what = [[Too many variables in an assignment may cause a
C stack overflow]],
report = [[Mike Pall, on 07/2007]],
since = [[5.0]],
example = [[
$ ulimit -s 1024 # Reduce C stack to 1MB for quicker results
$ lua -e 'local s = "a,"; for i=1,18 do s = s..s end print(loadstring("local a;"..s.."a=nil", ""))'
]],
patch = [[
lparser.c:
@@ -938,6 +938,8 @@
primaryexp(ls, &nv.v);
if (nv.v.k == VLOCAL)
check_conflict(ls, lh, &nv.v);
+ luaY_checklimit(ls->fs, nvars, LUAI_MAXCCALLS - ls->L->nCcalls,
+ "variable names");
assignment(ls, &nv, nvars+1);
}
else { /* assignment -> `=' explist1 */
]],
}
Bug{
what = [[An error in a module loaded through the '-l' option
shows no traceback]],
report = [[David Manura, on 08/2007]],
since = [[5.1]],
example = [[lua -ltemp (assuming temp.lua has an error)]],
patch = [[
lua.c:
@@ -144,7 +144,7 @@
static int dolibrary (lua_State *L, const char *name) {
lua_getglobal(L, "require");
lua_pushstring(L, name);
- return report(L, lua_pcall(L, 1, 0, 0));
+ return report(L, docall(L, 1, 1));
}
]],
}
Bug{
what = [['gsub' may go wild when wrongly called without its third
argument and with a large subject]],
report = [[Florian Berger, on 10/2007]],
since = [[5.1]],
example = [[
x = string.rep('a', 10000) .. string.rep('b', 10000)
print(#string.gsub(x, 'b'))
]],
patch = [[
lstrlib.c:
@@ -631,6 +631,2 @@
}
- default: {
- luaL_argerror(L, 3, "string/function/table expected");
- return;
- }
}
@@ -650,2 +646,3 @@
const char *p = luaL_checkstring(L, 2);
+ int tr = lua_type(L, 3);
int max_s = luaL_optint(L, 4, srcl+1);
@@ -655,2 +652,5 @@
luaL_Buffer b;
+ luaL_argcheck(L, tr == LUA_TNUMBER || tr == LUA_TSTRING ||
+ tr == LUA_TFUNCTION || tr == LUA_TTABLE, 3,
+ "string/function/table expected");
luaL_buffinit(L, &b);
]],
}
Bug{
what = [[ ]],
report = [[ , on ]],
since = [[i ]],
example = [[ ]],
patch = [[ ]],
}
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