From a5dcce98aa0c77cf6c31aeb7e2cb0c12abeec1ba Mon Sep 17 00:00:00 2001
From: Guillaume Desmottes <guillaume.desmottes@collabora.co.uk>
Date: Mon, 15 Jun 2015 16:08:10 +0200
Subject: [PATCH] oggdemux: set building_chain to NULL when deactivating chain

The chain is about to be invalidated so we shouldn't keep it around.
Prevent a double free crash when the demuxer is being finalized.

https://bugzilla.gnome.org/show_bug.cgi?id=751000
---
 ext/ogg/gstoggdemux.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/ext/ogg/gstoggdemux.c b/ext/ogg/gstoggdemux.c
index 34f472c7d1..b758934914 100644
--- a/ext/ogg/gstoggdemux.c
+++ b/ext/ogg/gstoggdemux.c
@@ -2775,6 +2775,8 @@ gst_ogg_demux_deactivate_current_chain (GstOggDemux * ogg)
   /* if we cannot seek back to the chain, we can destroy the chain 
    * completely */
   if (!ogg->pullmode) {
+    if (ogg->building_chain == chain)
+      ogg->building_chain = NULL;
     gst_ogg_chain_free (chain);
   }