[PATCH 4.4 80/84] scsi: libcxgbi: add a check for NULL pointer in cxgbi_check_route()

[Greg Kroah-Hartman]

[ Upstream commit cc555759117e8349088e0c5d19f2f2a500bafdbd ]

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

Signed-off-by: Varun Prakash <va...@chelsio.com>
Signed-off-by: Martin K. Petersen <martin.peter...@oracle.com>
Signed-off-by: Sasha Levin <sas...@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 f3bb7af4e984..5eaf14c15590 100644
--- a/drivers/scsi/cxgbi/libcxgbi.c
+++ b/drivers/scsi/cxgbi/libcxgbi.c
@@ -634,6 +634,10 @@ static struct cxgbi_sock *cxgbi_check_route(struct 
sockaddr *dst_addr)
 
        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