[Bug 777530] decodebin3: Fix crash caused by slot double freeing

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=777530

Edward Hervey <bilboed at bilboed.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |bilboed at bilboed.com
         Resolution|---                         |FIXED
   Target Milestone|git master                  |1.11.2

--- Comment #3 from Edward Hervey <bilboed at bilboed.com> ---
commit 6b5617c2a72a4a48fdccfe5dfcce3fa56a9ca738
Author: Seungha Yang <sh.yang at lge.com>
Date:   Fri Jan 20 19:49:46 2017 +0900

    decodebin3: Fix crash caused by slot double freeing

    Probe for MultiQueue source pad might receive EOS twice,
    the first is fake-eos and the other is actual EOS.
    And the slot can be freed with fake-eos/EOS if the slot has no input.

    Since slot freeing is async, double free can be possible.
    So, decodebin3 needs to remove the probe also with slot freeing.

    https://bugzilla.gnome.org/show_bug.cgi?id=777530

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