From a6eb0714fa25f083959491abf631549deb51047a Mon Sep 17 00:00:00 2001
From: wm4 <wm4@nowhere>
Date: Mon, 13 Oct 2014 16:42:00 +0200
Subject: [PATCH] demux_mkv: fix undefined behavior

With some files, the extradata variable can remain uninitialized, but
will be used for memory access.

CC: @mpv-player/stable (with high priority)
---
 demux/demux_mkv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/demux/demux_mkv.c b/demux/demux_mkv.c
index 8c00a8fe8f..01939274da 100644
--- a/demux/demux_mkv.c
+++ b/demux/demux_mkv.c
@@ -1149,7 +1149,7 @@ static const videocodec_info_t vinfo[] = {
 
 static int demux_mkv_open_video(demuxer_t *demuxer, mkv_track_t *track)
 {
-    unsigned char *extradata;
+    unsigned char *extradata = NULL;
     unsigned int extradata_size = 0;
     bool raw = false;
     struct sh_stream *sh = new_sh_stream(demuxer, STREAM_VIDEO);