scsi: target: tcmu: Fix divide-by-zero in data_pages_per_blk store

tcmu_set_data_pages_per_blk() only validates the upper bound of the value
parsed from data_pages_per_blk=. Zero passes that check and is then used as
the divisor when computing udev->max_blocks:

  divide error: 0000 [#1] SMP
  ...
  tcmu_set_data_pages_per_blk
  tcmu_configure_device

Reject non-positive values, as the neighbouring max_data_area_mb and
cmd_ring_size setters already do.

Fixes: 08976cb548d6 ("scsi: target: tcmu: Make data_pages_per_blk changeable via configfs")
Signed-off-by: Shao Mingyin <shao.mingyin@zte.com.cn>
Cc: stable@vger.kernel.org
Reviewed-by: Bodo Stroesser <bostroesser@gmail.com>
Link: https://patch.msgid.link/20261026195245337ktSXy9G17VCcXyw760g9s@zte.com.cn
Signed-off-by: Martin K. Petersen (Oracle) <mkp@kernel.org>

0 files changed, 0 insertions, 0 deletions