From: Nigel Kirkland <nkirkland2304@gmail.com>
Date: Thu, 17 Aug 2023 12:43:01 -0700
Subject: nvme-fc: Prevent null pointer dereference in nvme_fc_io_getuuid()
Patch-mainline: v6.6-rc2
Git-commit: 8ae5b3a685dc59a8cf7ccfe0e850999ba9727a3c
References: bsc#1214842 CVE-2023-52508 bsc#1221015
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>
Acked-by: Martin Wilck <mwilck@suse.com>
---
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 1cd2bf82319a..a15b37750d6e 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);
}
--
2.42.0