From 038f3a173f59c9fc3396aa38e7972661da7ca504 Mon Sep 17 00:00:00 2001
From: Zhang Rui <bbcallen@gmail.com>
Date: Thu, 29 Jan 2015 17:55:32 +0800
Subject: [PATCH] avformat/concatdec: avoid NULL dereference when failed to
 open file.

Reviewed-by: Nicolas George <george@nsup.org>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
---
 libavformat/concatdec.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavformat/concatdec.c b/libavformat/concatdec.c
index e109524de1..f07cfd7e8f 100644
--- a/libavformat/concatdec.c
+++ b/libavformat/concatdec.c
@@ -482,6 +482,9 @@ static int concat_read_packet(AVFormatContext *avf, AVPacket *pkt)
     ConcatStream *cs;
     AVStream *st;
 
+    if (!cat->avf)
+        return AVERROR(EIO);
+
     while (1) {
         ret = av_read_frame(cat->avf, pkt);
         if (ret == AVERROR_EOF) {