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element: Add sanity check with a critical warning if a pad is requested for a pad template that is not installed on the element class

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Various elements are assuming that the pointer matches a pad template
they know about, and also randomly created pad templates might be
missing some important information that is necessary to create a valid
pad.

For example, creating a new pad template for audiomixer's sinkpad
without providing the correct GType would cause audiomixer to create a
GstAggregatorPad. That will then later fail spectacularly because it
assumes that it got a GstAudioAggregatorPad.

Passing a pad template that does not belong to the element class in here
will easily lead to undefined behaviour.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2410>
This commit is contained in:
Sebastian Dröge 2022-05-12 20:15:44 +03:00 committed by GStreamer Marge Bot
parent aa3b6a11e0
commit fbf0cc2279
1 changed files with 10 additions and 0 deletions
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10
subprojects/gstreamer/gst/gstelement.c
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@ -1165,6 +1165,16 @@ _gst_element_request_pad (GstElement * element, GstPadTemplate * templ,
}
#endif
#ifdef GST_ENABLE_EXTRA_CHECKS
{
if (!g_list_find (oclass->padtemplates, templ)) {
/* FIXME 2.0: Change this to g_return_val_if_fail() */
g_critical ("Element type %s does not have a pad template %s (%p)",
g_type_name (G_OBJECT_TYPE (element)), templ->name_template, templ);
}
}
#endif
if (oclass->request_new_pad)
newpad = (oclass->request_new_pad) (element, templ, name, caps);