[Bug 777146] vaapisink: segfault caused by race condition with OverlayInterface expose method

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=777146

--- Comment #8 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
(In reply to Matt Staples from comment #7)
> I like the general approach.  It certainly simplifies the overlay_expose
> method.  
> However, the race condition is still there as long as the call,
> "gst_buffer_replace(&sink->videoBuffer, buffer);" is made outside the lock.

Got it! I'll update the patch. Thanks!

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