libcxgbi: Handle dst_get_neighbour_noref() returning NULL.

Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Roland Dreier <roland@purestorage.com>

1 files changed, 8 insertions, 2 deletions

diff --git a/drivers/scsi/cxgbi/libcxgbi.c b/drivers/scsi/cxgbi/libcxgbi.c
index a026a2f12621..1d25a87aa47b 100644
--- a/drivers/scsi/cxgbi/libcxgbi.c
+++ b/drivers/scsi/cxgbi/libcxgbi.c
@@ -472,6 +472,7 @@ static struct cxgbi_sock *cxgbi_check_route(struct sockaddr *dst_addr)
         struct net_device *ndev;
         struct cxgbi_device *cdev;
         struct rtable *rt = NULL;
+        struct neighbour *n;
         struct flowi4 fl4;
         struct cxgbi_sock *csk = NULL;
         unsigned int mtu = 0;
@@ -493,7 +494,12 @@ static struct cxgbi_sock *cxgbi_check_route(struct sockaddr *dst_addr)
                 goto err_out;
         }
         dst = &rt->dst;
-        ndev = dst_get_neighbour_noref(dst)->dev;
+        n = dst_get_neighbour_noref(dst);
+        if (!n) {
+                err = -ENODEV;
+                goto rel_rt;
+        }
+        ndev = n->dev;
 
         if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
                 pr_info("multi-cast route %pI4, port %u, dev %s.\n",
@@ -507,7 +513,7 @@ static struct cxgbi_sock *cxgbi_check_route(struct sockaddr *dst_addr)
                 ndev = ip_dev_find(&init_net, daddr->sin_addr.s_addr);
                 mtu = ndev->mtu;
                 pr_info("rt dev %s, loopback -> %s, mtu %u.\n",
-                        dst_get_neighbour_noref(dst)->dev->name, ndev->name, mtu);
+                        n->dev->name, ndev->name, mtu);
         }
 
         cdev = cxgbi_device_find_by_netdev(ndev, &port);