From ff100c9dd97d2f1f456ff38b192edf84f9744738 Mon Sep 17 00:00:00 2001
From: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
Date: Tue, 8 Nov 2016 00:42:23 +0100
Subject: [PATCH] matroskadec: fix NULL pointer dereference in
 webm_dash_manifest_read_header

The code assumes that s->streams[0] is valid.

Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
---
 libavformat/matroskadec.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
index d2a691bc06..f79511e4f1 100644
--- a/libavformat/matroskadec.c
+++ b/libavformat/matroskadec.c
@@ -3776,6 +3776,11 @@ static int webm_dash_manifest_read_header(AVFormatContext *s)
         av_log(s, AV_LOG_ERROR, "Failed to read file headers\n");
         return -1;
     }
+    if (!s->nb_streams) {
+        matroska_read_close(s);
+        av_log(s, AV_LOG_ERROR, "No streams found\n");
+        return AVERROR_INVALIDDATA;
+    }
 
     if (!matroska->is_live) {
         buf = av_asprintf("%g", matroska->duration);