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nvme-fc: Prevent null pointer dereference in nvme_fc_io_getuuid()

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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@gmail.com>
Reviewed-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Keith Busch <kbusch@kernel.org>
This commit is contained in:
Nigel Kirkland 2023-08-17 12:43:01 -07:00 committed by Keith Busch
parent 71be868472
commit 8ae5b3a685
1 changed files with 1 additions and 1 deletions
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2
drivers/nvme/host/fc.c
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@ -1924,7 +1924,7 @@ 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);
}