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BUG: stack overflow in vararg functions with many fixed

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parameters called with few arguments
This commit is contained in:
Roberto Ierusalimschy 2013-04-19 18:05:04 -03:00
parent 1294b09d8e
commit fa3b126a23
1 changed files with 11 additions and 4 deletions
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15
ldo.c
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@ -1,5 +1,5 @@
/*
** $Id: ldo.c,v 2.107 2012/08/28 18:30:45 roberto Exp roberto $
** $Id: ldo.c,v 2.108.1.2 2013/04/19 21:03:23 roberto Exp $
** Stack and Call structure of Lua
** See Copyright Notice in lua.h
*/
@ -260,6 +260,7 @@ static StkId adjust_varargs (lua_State *L, Proto *p, int actual) {
StkId base, fixed;
lua_assert(actual >= nfixargs);
/* move fixed parameters to final position */
luaD_checkstack(L, p->maxstacksize); /* check again for new 'base' */
fixed = L->top - actual; /* first fixed argument */
base = L->top; /* final position of first argument */
for (i=0; i<nfixargs; i++) {
@ -324,12 +325,18 @@ int luaD_precall (lua_State *L, StkId func, int nresults) {
case LUA_TLCL: { /* Lua function: prepare its call */
StkId base;
Proto *p = clLvalue(func)->p;
luaD_checkstack(L, p->maxstacksize);
func = restorestack(L, funcr);
n = cast_int(L->top - func) - 1; /* number of real arguments */
luaD_checkstack(L, p->maxstacksize);
for (; n < p->numparams; n++)
setnilvalue(L->top++); /* complete missing arguments */
base = (!p->is_vararg) ? func + 1 : adjust_varargs(L, p, n);
if (!p->is_vararg) {
func = restorestack(L, funcr);
base = func + 1;
}
else {
base = adjust_varargs(L, p, n);
func = restorestack(L, funcr); /* previous call can change stack */
}
ci = next_ci(L); /* now 'enter' new function */
ci->nresults = nresults;
ci->func = func;