[FFmpeg-cvslog] mpc8: Make sure the first stream exists before parsing the seek table

[Martin Storsjö]

ffmpeg | branch: master | Martin Storsjö <martin at martin.st> | Wed Sep 11 22:53:15 2013 +0300| [17d57848fc14e82f76a65ffb25c90f2f011dc4a0] | committer: Martin Storsjö

mpc8: Make sure the first stream exists before parsing the seek table

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable at libav.org
Signed-off-by: Martin Storsjö <martin at martin.st>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=17d57848fc14e82f76a65ffb25c90f2f011dc4a0
---

 libavformat/mpc8.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libavformat/mpc8.c b/libavformat/mpc8.c
index 29001b1..3564e81 100644
--- a/libavformat/mpc8.c
+++ b/libavformat/mpc8.c
@@ -139,6 +139,11 @@ 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){