gstglcontext: is_shared should return FALSE if no group

If a sub class of GstGLContext does not create a group
then it currently crashes:

0 g_atomic_int_get (&share->refcount)
1 _context_share_group_is_shared (context->priv->sharegroup)
2 gst_gl_context_is_shared
3 _default_set_sync_gl

https://bugzilla.gnome.org/show_bug.cgi?id=774518

diff --git a/gst-libs/gst/gl/gstglcontext.c b/gst-libs/gst/gl/gstglcontext.c
index 899c121c5caa61086f68f8d95ff04c4941ea606d..792aac726df7a46fc2240f9dd21ed6acac4ff7b6 100644 (file)
--- a/gst-libs/gst/gl/gstglcontext.c
+++ b/gst-libs/gst/gl/gstglcontext.c
@@ -1670,6 +1670,10 @@ gboolean
 gst_gl_context_is_shared (GstGLContext * context)
 {
   g_return_val_if_fail (GST_IS_GL_CONTEXT (context), FALSE);
+
+  if (!context->priv->sharegroup)
+    return FALSE;
+
   if (GST_IS_GL_WRAPPED_CONTEXT (context))
     g_return_val_if_fail (context->priv->active_thread, FALSE);
   else