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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Varun Prakash <varun@chelsio.com>,
        "Martin K. Petersen" <martin.petersen@oracle.com>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.1 88/98] scsi: libcxgbi: add a check for NULL pointer in cxgbi_check_route()
Date:   Thu, 20 Jun 2019 19:57:55 +0200
Message-Id: <20190620174353.779238128@linuxfoundation.org>
In-Reply-To: <20190620174349.443386789@linuxfoundation.org>
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[ Upstream commit cc555759117e8349088e0c5d19f2f2a500bafdbd ]

ip_dev_find() can return NULL so add a check for NULL pointer.

Signed-off-by: Varun Prakash <varun@chelsio.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/scsi/cxgbi/libcxgbi.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/scsi/cxgbi/libcxgbi.c b/drivers/scsi/cxgbi/libcxgbi.c
index 006372b3fba2..a50734f3c486 100644
--- a/drivers/scsi/cxgbi/libcxgbi.c
+++ b/drivers/scsi/cxgbi/libcxgbi.c
@@ -641,6 +641,10 @@ cxgbi_check_route(struct sockaddr *dst_addr, int ifindex)
 
 	if (ndev->flags & IFF_LOOPBACK) {
 		ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
+		if (!ndev) {
+			err = -ENETUNREACH;
+			goto rel_neigh;
+		}
 		mtu = ndev->mtu;
 		pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
 			n->dev->name, ndev->name, mtu);
-- 
2.20.1