From d108ed2251f1f402755d862e83ab0944c552f5c6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?V=C3=ADctor=20Manuel=20J=C3=A1quez=20Leal?=
 <vjaquez@igalia.com>
Date: Fri, 28 Apr 2017 19:43:49 +0200
Subject: [PATCH] gst: check non-null before dereference

It is possible to use gst_deinit() without registering the base
classes. For example, when using gst_init_get_option_group() and
call the program with an invalid parameter. In that case,
gst_deinit() will lead to a segmentation fault, since there is a
dereference to a pointer that is null.

This patch validates if the type is non-null before dereferencing
it.

https://bugzilla.gnome.org/show_bug.cgi?id=781914
---
 gst/gst.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gst/gst.c b/gst/gst.c
index 8087aa4109..e0225b4863 100644
--- a/gst/gst.c
+++ b/gst/gst.c
@@ -1003,7 +1003,7 @@ gst_deinit (void)
   }
   g_thread_pool_set_max_unused_threads (0);
   bin_class = GST_BIN_CLASS (g_type_class_peek (gst_bin_get_type ()));
-  if (bin_class->pool != NULL) {
+  if (bin_class && bin_class->pool != NULL) {
     g_thread_pool_free (bin_class->pool, FALSE, TRUE);
     bin_class->pool = NULL;
   }