kernel: panic when submitting certain 0-length I/O requests

The blkrqmapuseriov function in block/blk-map.c in the Linux kernel before 2.6.37-rc7 allows local users to cause a denial of service panic via a zero-length I/O request in a device ioctl to a SCSI device, related to an unaligned map. NOTE: this vulnerability exists because of an incomplete fix f...