From 620ab797f03ecb3f1df9e24590ff2b669c49e319 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Wed, 28 Jul 2004 01:35:29 +0000
Subject: [PATCH] 1/0 fix

Originally committed as revision 3357 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavcodec/snow.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavcodec/snow.c b/libavcodec/snow.c
index 1870461d9d..bf454b9103 100644
--- a/libavcodec/snow.c
+++ b/libavcodec/snow.c
@@ -1701,6 +1701,8 @@ static void add_xblock(DWTELEM *dst, uint8_t *src, uint8_t *obmc, int s_x, int s
         b_h = h - s_y;
     }
 
+    if(b_w<=0 || b_h<=0) return;
+    
     dst += s_x + s_y*dst_stride;
     
     if(mb_type==1){