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Bug: finalizers can be called with an invalid stack
The call to 'checkstackGC' can run finalizers, which will find an
inconsistent CallInfo, as 'ci' is half updated at the point of call.
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roberto-ieru committed Dec 15, 2021
1 parent 066e0f9 commit cf613cd
Showing 1 changed file with 1 addition and 1 deletion.
2 changes: 1 addition & 1 deletion ldo.c
Expand Up @@ -530,10 +530,10 @@ int luaD_pretailcall (lua_State *L, CallInfo *ci, StkId func,
int fsize = p->maxstacksize; /* frame size */
int nfixparams = p->numparams;
int i;
checkstackGCp(L, fsize - delta, func);
ci->func -= delta; /* restore 'func' (if vararg) */
for (i = 0; i < narg1; i++) /* move down function and arguments */
setobjs2s(L, ci->func + i, func + i);
checkstackGC(L, fsize);
func = ci->func; /* moved-down function */
for (; narg1 <= nfixparams; narg1++)
setnilvalue(s2v(func + narg1)); /* complete missing arguments */
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