bus: Add guards against invalid arguments to set_flushing() and poll()

https://bugzilla.gnome.org/show_bug.cgi?id=746871

diff --git a/gst/gstbus.c b/gst/gstbus.c
index 7865079..fbe2464 100644 (file)
--- a/gst/gstbus.c
+++ b/gst/gstbus.c
@@ -448,6 +448,8 @@ gst_bus_set_flushing (GstBus * bus, gboolean flushing)
   GstMessage *message;
   GList *message_list = NULL;
 
+  g_return_if_fail (GST_IS_BUS (bus));
+
   GST_OBJECT_LOCK (bus);
 
   if (flushing) {
@@ -1122,6 +1124,8 @@ gst_bus_poll (GstBus * bus, GstMessageType events, GstClockTime timeout)
   GstMessage *ret;
   gulong id;
 
+  g_return_val_if_fail (GST_IS_BUS (bus), NULL);
+
   poll_data = g_slice_new (GstBusPollData);
   poll_data->source_running = TRUE;
   poll_data->loop = g_main_loop_new (NULL, FALSE);