[FFmpeg-cvslog] avformat/matroskadec: Do not leak queued packets on sync errors

[Michael Niedermayer]

ffmpeg | branch: release/3.4 | Michael Niedermayer <michael at niedermayer.cc> | Wed Feb  6 15:29:38 2019 +0100| [f9067108708ade40b6989328d22e84a73e408759] | committer: Michael Niedermayer

avformat/matroskadec: Do not leak queued packets on sync errors

Fixes: memleak
Fixes: clusterfuzz-testcase-minimized-audio_decoder_fuzzer-5649187601121280

Reported-by: Chris Cunningham <chcunningham at google.com>
Tested-by: Chris Cunningham <chcunningham at google.com>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit d1afa7284c3feba4debfebf1b9cf8ad67640e34a)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=f9067108708ade40b6989328d22e84a73e408759
---

 libavformat/matroskadec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
index 95189525e3..c65a912408 100644
--- a/libavformat/matroskadec.c
+++ b/libavformat/matroskadec.c
@@ -3507,7 +3507,7 @@ static int matroska_read_packet(AVFormatContext *s, AVPacket *pkt)
             ret = matroska_resync(matroska, pos);
     }
 
-    return ret;
+    return 0;
 }
 
 static int matroska_read_seek(AVFormatContext *s, int stream_index,