linux-kernel - [PATCH 4.19 56/72] scsi: qla4xxx: fix a potential NULL pointer dereference

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Date:   Thu,  2 May 2019 17:21:18 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Kangjie Lu <kjlu@....edu>,
        Manish Rangankar <mrangankar@...vell.com>,
        Mukesh Ojha <mojha@...eaurora.org>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        "Sasha Levin (Microsoft)" <sashal@...nel.org>
Subject: [PATCH 4.19 56/72] scsi: qla4xxx: fix a potential NULL pointer dereference

[ Upstream commit fba1bdd2a9a93f3e2181ec1936a3c2f6b37e7ed6 ]

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

Signed-off-by: Kangjie Lu <kjlu@....edu>
Acked-by: Manish Rangankar <mrangankar@...vell.com>
Reviewed-by: Mukesh Ojha <mojha@...eaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin (Microsoft) <sashal@...nel.org>
---
 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 575445c761b4..5dd3e4e01b10 100644
--- a/drivers/scsi/qla4xxx/ql4_os.c
+++ b/drivers/scsi/qla4xxx/ql4_os.c
@@ -3204,6 +3204,8 @@ 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;
-- 
2.19.1