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Backport CVE-2020-24370's patch

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Yiheng Cao 2024-02-03 21:29:27 +08:00 • committed by GitHub
commit 845e4f4acb
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GPG key ID: B5690EEEBB952194
1 changed files with 4 additions and 3 deletions
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7
liblua/ldebug.c
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@ -106,10 +106,11 @@ static const char *upvalname (Proto *p, int uv) {
static const char *findvararg (CallInfo *ci, int n, StkId *pos) {
int nparams = clLvalue(ci->func)->p->numparams;
if (n >= ci->u.l.base - ci->func - nparams)
int nvararg = cast_int(ci->u.l.base - ci->func) - nparams;
if (n <= -nvararg)
return NULL; /* no such vararg */
else {
*pos = ci->func + nparams + n;
*pos = ci->func + nparams - n;
return "(*vararg)"; /* generic name for any vararg */
}
}
@ -121,7 +122,7 @@ static const char *findlocal (lua_State *L, CallInfo *ci, int n,
StkId base;
if (isLua(ci)) {
if (n < 0) /* access to vararg values? */
return findvararg(ci, -n, pos);
return findvararg(ci, n, pos);
else {
base = ci->u.l.base;
name = luaF_getlocalname(ci_func(ci)->p, n, currentpc(ci));