[Bug 741746] New: Vp8enc produces a segmentation fault

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=741746
  GStreamer | gst-plugins-good | 1.x

           Summary: Vp8enc produces a segmentation fault
    Classification: Platform
           Product: GStreamer
           Version: 1.x
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: santoscadenas at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=293029)
 View: https://bugzilla.gnome.org/attachment.cgi?id=293029
 Review: https://bugzilla.gnome.org/review?bug=741746&attachment=293029

vp8enc: Fix segmentation fault when gst_vide_frame_map fails

I've detected that in some circumstances (don't know exactly when), vp8 encoder
produces a segmentation fault. Tracing the coredump it seems that the problems
occurs when gst_vide_frame_map fails, it is not controlled and processing
continues trying to use data that has not been generated.

I attach a patch that could not be perfect, but at least shows the part that I
think that has problems.

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