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ghostpad: fix race-condition while tearing down

Browse source 
An upstream query will take a ref on the internal proxypad, and can
hence end up owning the last reference to that pad, causing a crash.
This commit is contained in:
Havard Graff 2017-03-30 09:17:08 +02:00 committed by Tim-Philipp Müller
parent 77502acabc
commit e515aa06fe
2 changed files with 60 additions and 6 deletions
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20
gst/gstghostpad.c
View file

@ -506,13 +506,16 @@ gst_ghost_pad_dispose (GObject * object)
GST_OBJECT_LOCK (pad);
internal = GST_PROXY_PAD_INTERNAL (pad);
if (internal) {
gst_pad_set_activatemode_function (internal, NULL);
gst_pad_set_activatemode_function (internal, NULL);
GST_PROXY_PAD_INTERNAL (pad) = NULL;
GST_PROXY_PAD_INTERNAL (internal) = NULL;
/* disposes of the internal pad, since the ghostpad is the only possible object
* that has a refcount on the internal pad. */
gst_object_unparent (GST_OBJECT_CAST (internal));
GST_PROXY_PAD_INTERNAL (pad) = NULL;
/* disposes of the internal pad, since the ghostpad is the only possible object
* that has a refcount on the internal pad. */
gst_object_unparent (GST_OBJECT_CAST (internal));
}
GST_OBJECT_UNLOCK (pad);
@ -831,7 +834,12 @@ gst_ghost_pad_set_target (GstGhostPad * gpad, GstPad * newtarget)
g_return_val_if_fail (GST_IS_GHOST_PAD (gpad), FALSE);
g_return_val_if_fail (GST_PAD_CAST (gpad) != newtarget, FALSE);
g_return_val_if_fail (newtarget != GST_PROXY_PAD_INTERNAL (gpad), FALSE);
if (newtarget == GST_PROXY_PAD_INTERNAL (gpad)) {
GST_WARNING_OBJECT (gpad, "Target has already been set to %s:%s",
GST_DEBUG_PAD_NAME (newtarget));
return FALSE;
}
GST_OBJECT_LOCK (gpad);
internal = GST_PROXY_PAD_INTERNAL (gpad);

46
tests/check/gst/gstghostpad.c
View file

@ -1321,6 +1321,51 @@ GST_START_TEST (test_activate_sink_switch_mode)
GST_END_TEST;
static gboolean thread_running;
static gpointer
send_query_to_pad_func (GstPad * pad)
{
GstQuery *query = gst_query_new_latency ();
while (thread_running) {
gst_pad_peer_query (pad, query);
g_thread_yield ();
}
gst_query_unref (query);
return NULL;
}
GST_START_TEST (test_stress_upstream_queries_while_tearing_down)
{
GThread *query_thread;
gint i;
GstPad *pad = gst_pad_new ("sink", GST_PAD_SINK);
gst_pad_set_active (pad, TRUE);
thread_running = TRUE;
query_thread = g_thread_new ("queries",
(GThreadFunc) send_query_to_pad_func, pad);
for (i = 0; i < 1000; i++) {
GstPad *ghostpad = gst_ghost_pad_new ("ghost-sink", pad);
gst_pad_set_active (ghostpad, TRUE);
g_thread_yield ();
gst_ghost_pad_set_target (GST_GHOST_PAD_CAST (ghostpad), NULL);
gst_pad_set_active (pad, FALSE);
gst_object_unref (ghostpad);
}
thread_running = FALSE;
g_thread_join (query_thread);
gst_object_unref (pad);
}
GST_END_TEST;
static Suite *
gst_ghost_pad_suite (void)
{
@ -1351,6 +1396,7 @@ gst_ghost_pad_suite (void)
tcase_add_test (tc_chain, test_activate_sink_and_src);
tcase_add_test (tc_chain, test_activate_src_pull_mode);
tcase_add_test (tc_chain, test_activate_sink_switch_mode);
tcase_add_test (tc_chain, test_stress_upstream_queries_while_tearing_down);
return s;
}