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Bug: cannot allow the call 'debug.getinfo(0, ">")'

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A 'what' argument starting with '>' indicates that there is a function
in the C stack, which won't be there if the first argument is not a
function.
This commit is contained in:
Roberto Ierusalimschy 2021-02-15 10:38:09 -03:00
parent bc970005ce
commit 38cc7d40a4
2 changed files with 2 additions and 0 deletions
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1
ldblib.c
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@ -152,6 +152,7 @@ static int db_getinfo (lua_State *L) {
lua_State *L1 = getthread(L, &arg);
const char *options = luaL_optstring(L, arg+2, "flnSrtu");
checkstack(L, L1, 3);
luaL_argcheck(L, options[0] != '>', arg + 2, "invalid option '>'");
if (lua_isfunction(L, arg + 1)) { /* info about a function? */
options = lua_pushfstring(L, ">%s", options); /* add '>' to 'options' */
lua_pushvalue(L, arg + 1); /* move function to 'L1' stack */

1
testes/db.lua
View File

@ -31,6 +31,7 @@ end
do
assert(not pcall(debug.getinfo, print, "X")) -- invalid option
assert(not pcall(debug.getinfo, 0, ">")) -- invalid option
assert(not debug.getinfo(1000)) -- out of range level
assert(not debug.getinfo(-1)) -- out of range level
local a = debug.getinfo(print)