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gst/gstpad.c: Really unlink the peer pad instead of setting the peer pointer to NULL when we dispose the pad.

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Original commit message from CVS:
* gst/gstpad.c: (gst_pad_dispose):
Really unlink the peer pad instead of setting the peer pointer to NULL
when we dispose the pad.
This correctly calls the unlink functions and makes sure that the peer
does not have a handle to invalid memory. See #504671.
* tests/check/gst/gstpad.c: (GST_START_TEST), (gst_pad_suite):
Add testsuite for above case.
This commit is contained in:
Wim Taymans 2007-12-21 13:54:07 +00:00
parent b0ba7ff031
commit 96d28a501f
3 changed files with 93 additions and 3 deletions
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11
ChangeLog
View file

@ -1,3 +1,14 @@
2007-12-21 Wim Taymans <wim.taymans@collabora.co.uk>
* gst/gstpad.c: (gst_pad_dispose):
Really unlink the peer pad instead of setting the peer pointer to NULL
when we dispose the pad.
This correctly calls the unlink functions and makes sure that the peer
does not have a handle to invalid memory. See #504671.
* tests/check/gst/gstpad.c: (GST_START_TEST), (gst_pad_suite):
Add testsuite for above case.
2007-12-20 Tim-Philipp Müller <tim at centricular dot net>
Patch by: Peter Kjellerstedt <pkj axis com>

16
gst/gstpad.c
View file

@ -367,12 +367,22 @@ static void
gst_pad_dispose (GObject * object)
{
GstPad *pad = GST_PAD (object);
GstPad *peer;
GST_CAT_DEBUG_OBJECT (GST_CAT_REFCOUNTING, pad, "dispose");
/* we don't hold a ref to the peer so we can just set the
* peer to NULL. */
GST_PAD_PEER (pad) = NULL;
/* unlink the peer pad */
if ((peer = gst_pad_get_peer (pad))) {
/* window for MT unsafeness, someone else could unlink here
* and then we call unlink with wrong pads. The unlink
* function would catch this and safely return failed. */
if (GST_PAD_IS_SRC (pad))
gst_pad_unlink (pad, peer);
else
gst_pad_unlink (peer, pad);
gst_object_unref (peer);
}
/* clear the caps */
gst_caps_replace (&GST_PAD_CAPS (pad), NULL);

69
tests/check/gst/gstpad.c
View file

@ -510,6 +510,73 @@ GST_START_TEST (test_push_negotiation)
GST_END_TEST;
/* see that an unref also unlinks the pads */
GST_START_TEST (test_src_unref_unlink)
{
GstPad *src, *sink;
GstCaps *caps;
GstPadLinkReturn plr;
sink = gst_pad_new ("sink", GST_PAD_SINK);
fail_if (sink == NULL);
src = gst_pad_new ("src", GST_PAD_SRC);
fail_if (src == NULL);
caps = gst_caps_from_string ("foo/bar");
gst_pad_set_caps (src, caps);
gst_pad_set_caps (sink, caps);
plr = gst_pad_link (src, sink);
fail_unless (GST_PAD_LINK_SUCCESSFUL (plr));
/* unref the srcpad */
gst_object_unref (src);
/* sink should be unlinked now */
fail_if (gst_pad_is_linked (sink));
/* cleanup */
gst_object_unref (sink);
gst_caps_unref (caps);
}
GST_END_TEST;
/* see that an unref also unlinks the pads */
GST_START_TEST (test_sink_unref_unlink)
{
GstPad *src, *sink;
GstCaps *caps;
GstPadLinkReturn plr;
sink = gst_pad_new ("sink", GST_PAD_SINK);
fail_if (sink == NULL);
src = gst_pad_new ("src", GST_PAD_SRC);
fail_if (src == NULL);
caps = gst_caps_from_string ("foo/bar");
gst_pad_set_caps (src, caps);
gst_pad_set_caps (sink, caps);
plr = gst_pad_link (src, sink);
fail_unless (GST_PAD_LINK_SUCCESSFUL (plr));
/* unref the sinkpad */
gst_object_unref (sink);
/* src should be unlinked now */
fail_if (gst_pad_is_linked (src));
/* cleanup */
gst_object_unref (src);
gst_caps_unref (caps);
}
GST_END_TEST;
Suite *
gst_pad_suite (void)
@ -530,6 +597,8 @@ gst_pad_suite (void)
tcase_add_test (tc_chain, test_push_linked);
tcase_add_test (tc_chain, test_flowreturn);
tcase_add_test (tc_chain, test_push_negotiation);
tcase_add_test (tc_chain, test_src_unref_unlink);
tcase_add_test (tc_chain, test_sink_unref_unlink);
return s;
}