The blk_rq_map_user_iov function in block/blk-map.c in the Linux
kernel before 22.214.171.124 allows local users to cause a denial of service
(panic) via a zero-length I/O request in a device ioctl to a SCSI
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MLIST:[oss-security] 20101110 CVE request: kernel: Multiple DoS issues in block layer
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