The mm_decode_inter function in mmvideo.c in libavcodec in FFmpeg before 1.2.1 does not validate the relationship between a horizontal coordinate and a width value, which allows remote attackers to cause a denial of service (out-of-bounds array access and application crash) via crafted American Laser Games (ALG) MM Video data.
http://www.mandriva.com/security/advisories?name=MDVSA-2014:227
http://git.videolan.org/?p=ffmpeg.git%3Ba=commit%3Bh=8d3c99e825317b7efda5fd12e69896b47c700303
http://git.videolan.org/?p=ffmpeg.git%3Ba=commit%3Bh=7fa6db2545643efb4fe2e0bb501fa50af35a6330