The msrle_decode_frame function in libavcodec/msrle.c in FFmpeg before 2.1.4 does not properly calculate line sizes, which allows remote attackers to cause a denial of service (out-of-bounds array access) or possibly have unspecified other impact via crafted Microsoft RLE video data.
http://git.videolan.org/?p=ffmpeg.git%3Ba=commit%3Bh=c919e1ca2ecfc47d796382973ba0e48b8f6f92a2