[Bug 762856] It is possible hit Buffer Overflow - Array Index Out of Bounds in fill_iq_matrix_8x8 for H264

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=762856

--- Comment #1 from sreerenj <bsreerenj at gmail.com> ---
We never hit this code,   See the code before invoking fill_iq_matrix_8x8()

/* XXX: we can only support 4:2:0 or 4:2:2 since ScalingLists8x8[]
     is not large enough to hold lists for 4:4:4 */
  if (sps->chroma_format_idc == 3)
    return GST_VAAPI_DECODER_STATUS_ERROR_UNSUPPORTED_CHROMA_FORMAT;

Parse is supposed to parse whatever possible, which can be up to 6 scaling
lists for 8x8, but libva only support two.

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