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added an 'api_check' for negative sizes in 'lua_checkstack'

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Roberto Ierusalimschy
2014-04-01 15:51:23 -03:00
parent 315c5bf7b7
commit 493b3fdd65
1 changed files with 2 additions and 1 deletions
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lapi.c
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@@ -1,5 +1,5 @@
/* /*
** $Id: lapi.c,v 2.200 2014/02/26 12:39:30 roberto Exp roberto $ ** $Id: lapi.c,v 2.201 2014/03/12 20:57:40 roberto Exp roberto $
** Lua API ** Lua API
** See Copyright Notice in lua.h ** See Copyright Notice in lua.h
*/ */
@@ -94,6 +94,7 @@ LUA_API int lua_checkstack (lua_State *L, int size) {
int res; int res;
CallInfo *ci = L->ci; CallInfo *ci = L->ci;
lua_lock(L); lua_lock(L);
api_check(L, size >= 0, "negative 'size'");
if (L->stack_last - L->top > size) /* stack large enough? */ if (L->stack_last - L->top > size) /* stack large enough? */
res = 1; /* yes; check is OK */ res = 1; /* yes; check is OK */
else { /* no; need to grow stack */ else { /* no; need to grow stack */