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_wplua_pcall: avoid Lua stack overflow

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C code must ensure that the Lua stack does not overflow.  Ensure there
are enough slots for both the error handler and for the return values.
This commit is contained in:
Demi Marie Obenour 2025-07-04 17:00:31 -04:00 • committed by George Kiagiadakis
parent db755a6a19
commit 2ea068de1b
1 changed files with 22 additions and 1 deletions
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23
modules/module-lua-scripting/wplua/wplua.c
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@ -70,9 +70,30 @@ _wplua_errhandler (lua_State *L)
int
_wplua_pcall (lua_State *L, int nargs, int nret)
{
int hpos = lua_gettop (L) - nargs;
int slots = lua_gettop (L);
int ret = LUA_OK;
/* 1 stack slot needed for error handler. */
int hpos, stack_slots = 1;
if (nargs < 0)
g_error ("negative number of arguments");
/* Need nargs + 1 stack slots for function and its arguments. */
if (slots <= nargs)
g_error ("not enough stack slots for arguments and function");
if (nret != LUA_MULTRET) {
if (nret - nargs > 1) {
/* Need more stack slots: 1 for the error handler and (nret - (nargs + 1))
* for the return values (after popping the function and its arguments). */
stack_slots = nret - nargs;
} else if (nret < 0)
g_error ("negative number of return values");
}
if (!lua_checkstack (L, stack_slots)) {
wp_critical ("_wplua_pcall: cannot grow Lua stack");
return LUA_ERRMEM;
}
hpos = slots - nargs;
lua_pushcfunction (L, _wplua_errhandler);
lua_insert (L, hpos);