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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Changhui Zhong <czhong@redhat.com>,
        Christoph Hellwig <hch@lst.de>,
        Tomas Henzl <thenzl@redhat.com>,
        "Martin K. Petersen" <martin.petersen@oracle.com>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.17 199/343] scsi: core: scsi_logging: Fix a BUG
Date:   Tue, 12 Apr 2022 08:30:17 +0200
Message-Id: <20220412062957.099091906@linuxfoundation.org>
In-Reply-To: <20220412062951.095765152@linuxfoundation.org>
References: <20220412062951.095765152@linuxfoundation.org>
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From: Tomas Henzl <thenzl@redhat.com>

[ 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@redhat.com
Reported-by: Changhui Zhong <czhong@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Tomas Henzl <thenzl@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 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