scsi: sg: check length passed to SG_NEXT_CMD_LEN
The user can control the size of the next command passed along, but the value passed to the ioctl isn't checked against the usable max command size. Cc: <stable@vger.kernel.org> Signed-off-by: Peter Chang <dpf@google.com> Acked-by: Douglas Gilbert <dgilbert@interlog.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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