tee: Lock mutex before reading the removed flag of the pads

Otherwise we're not guaranteed to read the very latest value that
another thread might've written in there when the pad was released, and
could instead work with an old value.

diff --git a/plugins/elements/gsttee.c b/plugins/elements/gsttee.c
index f933509..5b33125 100644 (file)
--- a/plugins/elements/gsttee.c
+++ b/plugins/elements/gsttee.c
@@ -899,12 +899,14 @@ gst_tee_handle_data (GstTee * tee, gpointer data, gboolean is_list)
       ret = gst_pad_push (pad, GST_BUFFER_CAST (data));
     }
 
+    GST_OBJECT_LOCK (tee);
     if (GST_TEE_PAD_CAST (pad)->removed)
       ret = GST_FLOW_NOT_LINKED;
 
     if (ret == GST_FLOW_NOT_LINKED && tee->allow_not_linked) {
       ret = GST_FLOW_OK;
     }
+    GST_OBJECT_UNLOCK (tee);
 
     gst_object_unref (pad);