[DECNET]: Handle a failure in neigh_parms_alloc (take 2)

While enhancing the neighbour code to handle multiple network
namespaces I noticed that decnet is assuming neigh_parms_alloc
will allways succeed, which is clearly wrong.  So handle the
failure.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Acked-by: Steven Whitehouse <steve@chygwyn.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 9 insertions, 2 deletions

diff --git a/net/decnet/dn_dev.c b/net/decnet/dn_dev.c
index fc6f3c023a54..ed083ab455b7 100644
--- a/net/decnet/dn_dev.c
+++ b/net/decnet/dn_dev.c
@@ -1145,16 +1145,23 @@ struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
         init_timer(&dn_db->timer);
 
         dn_db->uptime = jiffies;
+
+        dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
+        if (!dn_db->neigh_parms) {
+                dev->dn_ptr = NULL;
+                kfree(dn_db);
+                return NULL;
+        }
+
         if (dn_db->parms.up) {
                 if (dn_db->parms.up(dev) < 0) {
+                        neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
                         dev->dn_ptr = NULL;
                         kfree(dn_db);
                         return NULL;
                 }
         }
 
-        dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
-
         dn_dev_sysctl_register(dev, &dn_db->parms);
 
         dn_dev_set_timer(dev);