linux-kernel - [PATCH AUTOSEL 6.1 01/28] nvme-fc: Prevent null pointer dereference in nvme_fc_io

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Message-Id: <20230924131745.1275960-1-sashal@kernel.org>
Date:   Sun, 24 Sep 2023 09:17:18 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Nigel Kirkland <nkirkland2304@...il.com>,
        James Smart <jsmart2021@...il.com>,
        Keith Busch <kbusch@...nel.org>,
        Sasha Levin <sashal@...nel.org>, james.smart@...adcom.com,
        sagi@...mberg.me, linux-nvme@...ts.infradead.org
Subject: [PATCH AUTOSEL 6.1 01/28] nvme-fc: Prevent null pointer dereference in nvme_fc_io_getuuid()

From: Nigel Kirkland <nkirkland2304@...il.com>

[ Upstream commit 8ae5b3a685dc59a8cf7ccfe0e850999ba9727a3c ]

The nvme_fc_fcp_op structure describing an AEN operation is initialized with a
null request structure pointer. An FC LLDD may make a call to
nvme_fc_io_getuuid passing a pointer to an nvmefc_fcp_req for an AEN operation.

Add validation of the request structure pointer before dereference.

Signed-off-by: Nigel Kirkland <nkirkland2304@...il.com>
Reviewed-by: James Smart <jsmart2021@...il.com>
Signed-off-by: Keith Busch <kbusch@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/nvme/host/fc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c
index 6c3d469eed7e3..177a365b8ec55 100644
--- a/drivers/nvme/host/fc.c
+++ b/drivers/nvme/host/fc.c
@@ -1911,7 +1911,7 @@ char *nvme_fc_io_getuuid(struct nvmefc_fcp_req *req)
 	struct nvme_fc_fcp_op *op = fcp_req_to_fcp_op(req);
 	struct request *rq = op->rq;
 
-	if (!IS_ENABLED(CONFIG_BLK_CGROUP_FC_APPID) || !rq->bio)
+	if (!IS_ENABLED(CONFIG_BLK_CGROUP_FC_APPID) || !rq || !rq->bio)
 		return NULL;
 	return blkcg_get_fc_appid(rq->bio);
 }
-- 
2.40.1