scsi: libcxgbi: add a check for NULL pointer in cxgbi_check_route()

[ Upstream commit cc555759 ]

ip_dev_find() can return NULL so add a check for NULL pointer.
Signed-off-by: NVarun Prakash <varun@chelsio.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

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);