From 9f532321d0bb88fc1bd321de44c89c64122acceb Mon Sep 17 00:00:00 2001
From: Piotr Caban <piotr@codeweavers.com>
Date: Mon, 21 Dec 2015 11:22:55 +0100
Subject: [PATCH] msvcrt: Return error if last known character is further in
 the string then current character.

Signed-off-by: Piotr Caban <piotr@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
---
 dlls/msvcrt/mbcs.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/dlls/msvcrt/mbcs.c b/dlls/msvcrt/mbcs.c
index e7adaad633a..56945bbb382 100644
--- a/dlls/msvcrt/mbcs.c
+++ b/dlls/msvcrt/mbcs.c
@@ -520,6 +520,9 @@ unsigned int CDECL _mbcjmstojis(unsigned int c)
  */
 unsigned char* CDECL _mbsdec(const unsigned char* start, const unsigned char* cur)
 {
+  if(start >= cur)
+    return NULL;
+
   if(get_mbcinfo()->ismbcodepage)
     return (unsigned char *)(_ismbstrail(start,cur-1) ? cur - 2 : cur -1);