Integer overflow in the ff_j2k_dwt_init function in libavcodec/j2k_dwt.c in FFmpeg before 0.9.1 allows remote attackers to cause a denial o…

Integer overflow in the ff_j2k_dwt_init function in libavcodec/j2k_dwt.c in FFmpeg before 0.9.1 allows remote attackers to cause a denial of service (segmentation fault and application crash) via a crafted JPEG2000 image that triggers an incorrect check for a negative value.