From: Nigel Kirkland nkirkland2304@gmail.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@gmail.com Reviewed-by: James Smart jsmart2021@gmail.com Signed-off-by: Keith Busch kbusch@kernel.org Signed-off-by: Sasha Levin sashal@kernel.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 1cd2bf82319a9..a15b37750d6e9 100644 --- a/drivers/nvme/host/fc.c +++ b/drivers/nvme/host/fc.c @@ -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); }