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 0588aca. Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com> Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
FFmpeg · Apr 22, 2015 · 86d00ed · 86d00ed
1 parent 4d98015
commit 86d00ed
Showing 1 changed file with 4 additions and 1 deletion.
diff --git 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;