linux-kernel - [PATCH] scsi: qla4xxx: fix a potential NULL pointer dereference

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Message-Id: <20190314063100.12805-1-kjlu@umn.edu>
Date:   Thu, 14 Mar 2019 01:30:59 -0500
From:   Kangjie Lu <kjlu@....edu>
To:     kjlu@....edu
Cc:     pakki001@....edu, QLogic-Storage-Upstream@...gic.com,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] scsi: qla4xxx: fix a potential NULL pointer dereference

In case iscsi_lookup_endpoint fails, the fix returns -EINVAL to
avoid NULL pointer dereference.

Signed-off-by: Kangjie Lu <kjlu@....edu>
---
 drivers/scsi/qla4xxx/ql4_os.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/scsi/qla4xxx/ql4_os.c b/drivers/scsi/qla4xxx/ql4_os.c
index a77bfb224248..80289c885c07 100644
--- a/drivers/scsi/qla4xxx/ql4_os.c
+++ b/drivers/scsi/qla4xxx/ql4_os.c
@@ -3203,6 +3203,8 @@ static int qla4xxx_conn_bind(struct iscsi_cls_session *cls_session,
 	if (iscsi_conn_bind(cls_session, cls_conn, is_leading))
 		return -EINVAL;
 	ep = iscsi_lookup_endpoint(transport_fd);
+	if (!ep)
+		return -EINVAL;
 	conn = cls_conn->dd_data;
 	qla_conn = conn->dd_data;
 	qla_conn->qla_ep = ep->dd_data;
-- 
2.17.1