From abb85fc059a5d6427b9dc36edee1619f2c7a1da8 Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Wed, 8 Jul 2009 13:06:51 -0300
Subject: new definition for 'luaD_checkstack' to avoid possible overflows

---
 ldo.h | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

(limited to 'ldo.h')

diff --git a/ldo.h b/ldo.h
index 3e0d50a8..6cd9fdca 100644
--- a/ldo.h
+++ b/ldo.h
@@ -1,5 +1,5 @@
 /*
-** $Id: ldo.h,v 2.12 2009/04/17 14:28:06 roberto Exp roberto $
+** $Id: ldo.h,v 2.13 2009/06/08 19:35:59 roberto Exp roberto $
 ** Stack and Call structure of Lua
 ** See Copyright Notice in lua.h
 */
@@ -13,9 +13,8 @@
 #include "lzio.h"
 
 
-#define luaD_checkstack(L,n)	\
-  if ((char *)L->stack_last - (char *)L->top <= (n)*(int)sizeof(TValue)) \
-    luaD_growstack(L, n); else condmovestack(L);
+#define luaD_checkstack(L,n)	if (L->stack_last - L->top <= (n)) \
+				    luaD_growstack(L, n); else condmovestack(L);
 
 
 #define incr_top(L) {L->top++; luaD_checkstack(L,0);}
-- 
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