From ae2d2d6c41c3b55ba06a021a3681a3173502423f Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Mon, 10 Feb 2003 22:43:30 +0000
Subject: [PATCH] check for qscale==0 (fixes 1/0 on one corrupted stream)

Originally committed as revision 1574 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavcodec/msmpeg4.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavcodec/msmpeg4.c b/libavcodec/msmpeg4.c
index 5aee0cf90a..a17890d527 100644
--- a/libavcodec/msmpeg4.c
+++ b/libavcodec/msmpeg4.c
@@ -1228,6 +1228,10 @@ return -1;
 }
 #endif
     s->qscale = get_bits(&s->gb, 5);
+    if(s->qscale==0){
+        fprintf(stderr, "invalid qscale\n");
+        return -1;
+    }
 
     if (s->pict_type == I_TYPE) {
         code = get_bits(&s->gb, 5);