libcxgbi: Handle dst_get_neighbour_noref() returning NULL.

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

diff --git a/drivers/scsi/cxgbi/libcxgbi.c b/drivers/scsi/cxgbi/libcxgbi.c
index a026a2f1262196b62bbcd9b8cd28e67026a27c7a..1d25a87aa47b2b561f1b948eef672e0b92b56ae7 100644 (file)
--- 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);