Dear stable kernel maintainers,
please consider including commit 9393c8de628c ("scsi: core: Handle
drivers which set sg_tablesize to zero") for inclusion in stable.
The commit fixes a long standing bug that affects all SCSI low-level
drivers setting sg_tablesize to zero, introduced in commit d285203c
("scsi: add support for a blk-mq based I/O path.") around kernel version
3.16.
Use of the option use_blk_mq=y in kernel versions prior to 5.1, and any
use of such drivers in later kernels, will result in a null pointer
dereference from the block layer.
I hadn't expected Martin Petersen to pick my fix over another one
submitted by Finn Thain, so I never added CC: or Fixes: tags.
Cheers,
Michael
