From 94ba1cea88788fd3ad72fadcc2ceb7884ed6df50 Mon Sep 17 00:00:00 2001 From: Nicolas Dufresne Date: Tue, 3 Sep 2019 13:44:24 -0400 Subject: [PATCH] bin: Fix minor race when adding to a bin This patch simply add a null check around a case where a child may have been unparented concurrently to the deep_add_remove operation. This was found by accident in the form of an "IS_GST_OBJECT" assertion, but had no other known side effect in that test. --- gst/gstbin.c | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-) diff --git a/gst/gstbin.c b/gst/gstbin.c index e5d4ecd..8e43d3f 100644 --- a/gst/gstbin.c +++ b/gst/gstbin.c @@ -1122,11 +1122,15 @@ gst_bin_do_deep_add_remove (GstBin * bin, gint sig_id, const gchar * sig_name, while ((e = g_queue_pop_head (&elements))) { GstObject *parent = gst_object_get_parent (GST_OBJECT_CAST (e)); - GST_LOG_OBJECT (bin, "calling %s for element %" GST_PTR_FORMAT - " in bin %" GST_PTR_FORMAT, sig_name, e, parent); - g_signal_emit (bin, sig_id, 0, parent, e); - gst_object_unref (parent); - g_object_unref (e); + /* an element could have removed some of its internal elements + * meanwhile, so protect against that */ + if (parent) { + GST_LOG_OBJECT (bin, "calling %s for element %" GST_PTR_FORMAT + " in bin %" GST_PTR_FORMAT, sig_name, e, parent); + g_signal_emit (bin, sig_id, 0, parent, e); + gst_object_unref (parent); + g_object_unref (e); + } } } gst_iterator_free (it); -- 2.7.4