From 096231d497457be9496b0be01ff6da2093186c3c Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Tue, 17 Apr 2012 17:42:09 +0200
Subject: [PATCH] avidec: Dont crash on avi packets that belong to dv streams
 in dv in avi

Fixes null pointer dereference

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
---
 libavformat/avidec.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libavformat/avidec.c b/libavformat/avidec.c
index c033b6276e..0300316d3c 100644
--- a/libavformat/avidec.c
+++ b/libavformat/avidec.c
@@ -958,6 +958,11 @@ start_sync:
             st = s->streams[n];
             ast = st->priv_data;
 
+            if (!ast) {
+                av_log(s, AV_LOG_WARNING, "Skiping foreign stream %d packet\n", n);
+                continue;
+            }
+
             if(s->nb_streams>=2){
                 AVStream *st1  = s->streams[1];
                 AVIStream *ast1= st1->priv_data;