scsi: scsi_debug: Fix buffer size of REPORT ZONES command

commit 7db0e0c8 upstream.

According to ZBC and SPC specifications, the unit of ALLOCATION LENGTH
field of REPORT ZONES command is byte. However, current scsi_debug
implementation handles it as number of zones to calculate buffer size to
report zones. When the ALLOCATION LENGTH has a large number, this results
in too large buffer size and causes memory allocation failure.  Fix the
failure by handling ALLOCATION LENGTH as byte unit.

Link: https://lore.kernel.org/r/20211207010638.124280-1-shinichiro.kawasaki@wdc.com


Fixes: f0d1cf93 ("scsi: scsi_debug: Add ZBC zone commands")
Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>