From 9291012d52a7eddda1ffa32c46d3fb6f1953b11e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Storsj=C3=B6?= <martin@martin.st>
Date: Wed, 11 Sep 2013 22:53:15 +0300
Subject: [PATCH] mpc8: Make sure the first stream exists before parsing the
 seek table
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Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
Signed-off-by: Martin Storsjö <martin@martin.st>
(cherry picked from commit 17d57848fc14e82f76a65ffb25c90f2f011dc4a0)
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
(cherry picked from commit 557df77eab7d3726c34221aeb999afe9e7818d52)
---
 libavformat/mpc8.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libavformat/mpc8.c b/libavformat/mpc8.c
index 97a9b01025..785a4f7a1c 100644
--- a/libavformat/mpc8.c
+++ b/libavformat/mpc8.c
@@ -137,6 +137,11 @@ static void mpc8_parse_seektable(AVFormatContext *s, int64_t off)
     int i, t, seekd;
     GetBitContext gb;
 
+    if (s->nb_streams == 0) {
+        av_log(s, AV_LOG_ERROR, "No stream added before parsing seek table\n");
+        return;
+    }
+
     avio_seek(s->pb, off, SEEK_SET);
     mpc8_get_chunk_header(s->pb, &tag, &size);
     if(tag != TAG_SEEKTABLE){