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

[GStreamer (GNOME Bugzilla)]

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

            Bug ID: 777146
           Summary: vaapisink: segfault caused by race condition with
                    OverlayInterface expose method
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer-vaapi
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: staples255 at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: bsreerenj at gmail.com, vjaquez at igalia.com
     GNOME version: ---

gst_vaapisink_overlay_expose calls gst_vaapisink_show_frame, passing a pointer
to sink->video_buffer, but that variable is accessed outside any lock. 
Meanwhile, gst_vaapisink_show_frame, which is also called from the main
data-flow thread, explicitly clears that variable outside the lock.

The result is that application calls to the expose method can occasionally
cause a segfault during playback.

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