[PATCH 5.17 199/343] scsi: core: scsi_logging: Fix a BUG

[Greg Kroah-Hartman]

From: Tomas Henzl <thenzl@xxxxxxxxxx>

[ Upstream commit f06aa52cb2723ec67e92df463827b800d6c477d1 ]

The request_queue may be NULL in a request, for example when it comes from
scsi_ioctl_reset(). Check it before use.

Fixes: f3fa33acca9f ("block: remove the ->rq_disk field in struct request")
Link: https://lore.kernel.org/r/20220324134603.28463-1-thenzl@xxxxxxxxxx
Reported-by: Changhui Zhong <czhong@xxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Tomas Henzl <thenzl@xxxxxxxxxx>
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/scsi/scsi_logging.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/scsi_logging.c b/drivers/scsi/scsi_logging.c
index 1f8f80b2dbfc..a9f8de5e9639 100644
--- a/drivers/scsi/scsi_logging.c
+++ b/drivers/scsi/scsi_logging.c
@@ -30,7 +30,7 @@ static inline const char *scmd_name(const struct scsi_cmnd *scmd)
 {
 	struct request *rq = scsi_cmd_to_rq((struct scsi_cmnd *)scmd);
 
-	if (!rq->q->disk)
+	if (!rq->q || !rq->q->disk)
 		return NULL;
 	return rq->q->disk->disk_name;
 }
-- 
2.35.1