From 68e1c80c67daeb29bd7e8d8d104faf9439b70b74 Mon Sep 17 00:00:00 2001
From: Andreas Cadhalpun <andreas.cadhalpun@googlemail.com>
Date: Sun, 3 May 2015 23:55:20 +0200
Subject: [PATCH] matroskadec: check s->streams[k] before using it

This fixes a segmentation fault.

Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit e54540655f229d06667dc7fa7005f2a20e101e80)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
---
 libavformat/matroskadec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
index 0d759fef91..49c1200367 100644
--- a/libavformat/matroskadec.c
+++ b/libavformat/matroskadec.c
@@ -1854,7 +1854,7 @@ static int matroska_read_header(AVFormatContext *s)
                 snprintf(buf, sizeof(buf), "%s_%d",
                          ff_matroska_video_stereo_plane[planes[j].type], i);
                 for (k=0; k < matroska->tracks.nb_elem; k++)
-                    if (planes[j].uid == tracks[k].uid) {
+                    if (planes[j].uid == tracks[k].uid && s->streams[k]) {
                         av_dict_set(&s->streams[k]->metadata,
                                     "stereo_mode", buf, 0);
                         break;