[Bug 752651] decodebin: segfault on setting to NULL

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=752651

--- Comment #13 from Vincent Penquerc'h <vincent.penquerch at collabora.co.uk> ---
I can't seem to be able to get the original crash, I always end up with one of
the two ones I posted traces earlier today.

I do recall getting the crash when I first looked at it a few weeks ago, and
group->parent was NULL.

The only calls I see to gst_decode_group_new are from
gst_decode_chain_get_current_group, which calls them with the chain variable,
which was always dereferenced earlier, here:

  /* Now we know that we can really return something useful */
  if (!chain->active_group) {

So I don't see how it can end up NULL in _group_new.

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