basesrc: Make src query MT-safe

It is possible that the element might be going down while the event arrives

diff --git a/libs/gst/base/gstbasesrc.c b/libs/gst/base/gstbasesrc.c
index 8db41f6..2b59d48 100644 (file)
--- a/libs/gst/base/gstbasesrc.c
+++ b/libs/gst/base/gstbasesrc.c
@@ -1112,6 +1112,8 @@ gst_base_src_query (GstPad * pad, GstQuery * query)
   gboolean result = FALSE;
 
   src = GST_BASE_SRC (gst_pad_get_parent (pad));
+  if (G_UNLIKELY (src == NULL))
+    return FALSE;
 
   bclass = GST_BASE_SRC_GET_CLASS (src);