huffyuvdec: check width size for yuv422p
Avoid out of array accesses. CC: libav-stable@libav.org Bug-Id: CVE-2013-0848 Signed-off-by: NVittorio Giovara <vittorio.giovara@gmail.com> Signed-off-by: NAnton Khirnov <anton@khirnov.net>
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