linux-kernel - [PATCH] scsi: lpfc: Fix potential NULL pointer dereference in lpfc_nvme_fcp_io

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Date:   Mon, 27 Nov 2017 07:52:30 -0600
From:   "Gustavo A. R. Silva" <garsilva@...eddedor.com>
To:     James Smart <james.smart@...adcom.com>,
        Dick Kennedy <dick.kennedy@...adcom.com>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <garsilva@...eddedor.com>
Subject: [PATCH] scsi: lpfc: Fix potential NULL pointer dereference in
 lpfc_nvme_fcp_io_submit

pnvme_lport is being dereferenced before it is null checked, hence there
is a potential null pointer dereference.

Fix this by null checking pnvme_lport before it is dereferenced.

Addresses-Coverity-ID: 1423709 ("Dereference before null check")
Fixes: b7672ae681f8 ("scsi: lpfc: Fix crash in lpfc_nvme_fcp_io_submit during LIP")
Signed-off-by: Gustavo A. R. Silva <garsilva@...eddedor.com>
---
Also, I wonder if the right pointer to check at line:

if (!pnvme_rport || !freqpriv) {

is pnvme_fcreq instead of freqpriv

 drivers/scsi/lpfc/lpfc_nvme.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/lpfc/lpfc_nvme.c b/drivers/scsi/lpfc/lpfc_nvme.c
index 517ae57..68cba7d 100644
--- a/drivers/scsi/lpfc/lpfc_nvme.c
+++ b/drivers/scsi/lpfc/lpfc_nvme.c
@@ -1251,6 +1251,11 @@ lpfc_nvme_fcp_io_submit(struct nvme_fc_local_port *pnvme_lport,
 	uint64_t start = 0;
 #endif
 
+	if (!pnvme_lport) {
+		ret = -ENODEV;
+		goto out_fail;
+	}
+
 	lport = (struct lpfc_nvme_lport *)pnvme_lport->private;
 	vport = lport->vport;
 	phba = vport->phba;
@@ -1261,7 +1266,7 @@ lpfc_nvme_fcp_io_submit(struct nvme_fc_local_port *pnvme_lport,
 	}
 
 	/* Validate pointers. */
-	if (!pnvme_lport || !pnvme_rport || !freqpriv) {
+	if (!pnvme_rport || !freqpriv) {
 		lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME_IOERR | LOG_NODE,
 				 "6117 No Send:IO submit ptrs NULL, lport %p, "
 				 "rport %p fcreq_priv %p\n",
-- 
2.7.4