From 9a9379ff7fc32e8e259d8c090cd8ccf08b27b09d Mon Sep 17 00:00:00 2001
From: Andreas Cadhalpun <andreas.cadhalpun@googlemail.com>
Date: Wed, 22 Apr 2015 17:08:51 +0200
Subject: [PATCH] bink: check vst->index_entries before using it

This fixes a NULL pointer dereference if vst->duration is 0.

The problem was introduced in commit 0588acaf.

Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 86d00ede4f9acb02690a0615490173648e1d933c)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
---
 libavformat/bink.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/libavformat/bink.c b/libavformat/bink.c
index 395c8d9aa8..350c64f7bb 100644
--- a/libavformat/bink.c
+++ b/libavformat/bink.c
@@ -194,7 +194,10 @@ static int read_header(AVFormatContext *s)
             return ret;
     }
 
-    avio_seek(pb, vst->index_entries[0].pos, SEEK_SET);
+    if (vst->index_entries)
+        avio_seek(pb, vst->index_entries[0].pos, SEEK_SET);
+    else
+        avio_skip(pb, 4);
 
     bink->current_track = -1;
     return 0;