[PATCH 4.9 066/137] scsi: smartpqi: correct volume status

From: Greg Kroah-Hartman
Date: Mon Feb 11 2019 - 10:15:57 EST

4.9-stable review patch. If anyone has any objections, please let me know.


[ Upstream commit 7ff44499bafbd376115f0bb6b578d980f56ee13b ]

- fix race condition when a unit is deleted after an RLL,
and before we have gotten the LV_STATUS page of the unit.
- In this case we will get a standard inquiry, rather than
the desired page. This will result in a unit presented
which no longer exists.
- If we ask for LV_STATUS, insure we get LV_STATUS

Reviewed-by: Murthy Bhat <murthy.bhat@xxxxxxxxxxxxx>
Reviewed-by: Mahesh Rajashekhara <mahesh.rajashekhara@xxxxxxxxxxxxx>
Reviewed-by: Scott Teel <scott.teel@xxxxxxxxxxxxx>
Reviewed-by: Kevin Barnett <kevin.barnett@xxxxxxxxxxxxx>
Signed-off-by: Dave Carroll <david.carroll@xxxxxxxxxxxxx>
Signed-off-by: Don Brace <don.brace@xxxxxxxxxxxxx>
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
drivers/scsi/smartpqi/smartpqi_init.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/scsi/smartpqi/smartpqi_init.c b/drivers/scsi/smartpqi/smartpqi_init.c
index 9a208961cc0b..06a062455404 100644
--- a/drivers/scsi/smartpqi/smartpqi_init.c
+++ b/drivers/scsi/smartpqi/smartpqi_init.c
@@ -983,6 +983,9 @@ static void pqi_get_volume_status(struct pqi_ctrl_info *ctrl_info,
if (rc)
goto out;

+ if (vpd->page_code != CISS_VPD_LV_STATUS)
+ goto out;
page_length = offsetof(struct ciss_vpd_logical_volume_status,
volume_status) + vpd->page_length;
if (page_length < sizeof(*vpd))