From 17ca3b176321fb3a33f4542982e6ff3e82a3d864 Mon Sep 17 00:00:00 2001 From: Roberto Ierusalimschy Date: Fri, 7 Nov 2014 09:31:58 -0200 Subject: [PATCH] cleaner test for overflow for range of 'math.random' --- lmathlib.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/lmathlib.c b/lmathlib.c index 212dc696..a643ef73 100644 --- a/lmathlib.c +++ b/lmathlib.c @@ -1,5 +1,5 @@ /* -** $Id: lmathlib.c,v 1.111 2014/10/24 11:42:06 roberto Exp roberto $ +** $Id: lmathlib.c,v 1.112 2014/11/02 19:19:04 roberto Exp roberto $ ** Standard mathematical library ** See Copyright Notice in lua.h */ @@ -258,8 +258,8 @@ static int math_random (lua_State *L) { } /* random integer in the interval [low, up] */ luaL_argcheck(L, low <= up, 1, "interval is empty"); - luaL_argcheck(L, (lua_Unsigned)up - low <= (lua_Unsigned)LUA_MAXINTEGER, - 1, "interval too large"); + luaL_argcheck(L, low >= 0 || up <= LUA_MAXINTEGER + low, 1, + "interval too large"); r *= (double)(up - low) + 1.0; lua_pushinteger(L, (lua_Integer)r + low); return 1;