batman-adv: Check hard_iface refcnt before calling function

[deliverable/linux.git] / net / batman-adv / originator.c

diff --git a/net/batman-adv/originator.c b/net/batman-adv/originator.c
index f885a41d06d53c290387dd8bf43316322ecf8d5d..2ed2cc89a669fc5afbeace39a807d7571618f077 100644 (file)
--- a/net/batman-adv/originator.c
+++ b/net/batman-adv/originator.c
@@ -1160,6 +1160,9 @@ static bool batadv_purge_orig_node(struct batadv_priv *bat_priv,
                if (hard_iface->soft_iface != bat_priv->soft_iface)
                        continue;
 
+               if (!kref_get_unless_zero(&hard_iface->refcount))
+                       continue;
+
                best_neigh_node = batadv_find_best_neighbor(bat_priv,
                                                            orig_node,
                                                            hard_iface);
@@ -1167,6 +1170,8 @@ static bool batadv_purge_orig_node(struct batadv_priv *bat_priv,
                                    best_neigh_node);
                if (best_neigh_node)
                        batadv_neigh_node_put(best_neigh_node);
+
+               batadv_hardif_put(hard_iface);
        }
        rcu_read_unlock();