batman-adv: Free last_bonding_candidate on release of orig_node

The orig_ifinfo reference counter for last_bonding_candidate in
batadv_orig_node has to be reduced when an originator node is released.
Otherwise the orig_ifinfo is leaked and the reference counter the netdevice
is not reduced correctly.

Fixes: f3b3d9018975 ("batman-adv: add bonding again")
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>

1 files changed, 7 insertions, 0 deletions

diff --git a/net/batman-adv/originator.c b/net/batman-adv/originator.c
index fe2fcda4a984..ab8c4f9738fe 100644
--- a/net/batman-adv/originator.c
+++ b/net/batman-adv/originator.c
@@ -766,6 +766,7 @@ static void batadv_orig_node_release(struct kref *ref)
         struct batadv_orig_node *orig_node;
         struct batadv_orig_ifinfo *orig_ifinfo;
         struct batadv_orig_node_vlan *vlan;
+        struct batadv_orig_ifinfo *last_candidate;
 
         orig_node = container_of(ref, struct batadv_orig_node, refcount);
 
@@ -783,8 +784,14 @@ static void batadv_orig_node_release(struct kref *ref)
                 hlist_del_rcu(&orig_ifinfo->list);
                 batadv_orig_ifinfo_put(orig_ifinfo);
         }
+
+        last_candidate = orig_node->last_bonding_candidate;
+        orig_node->last_bonding_candidate = NULL;
         spin_unlock_bh(&orig_node->neigh_list_lock);
 
+        if (last_candidate)
+                batadv_orig_ifinfo_put(last_candidate);
+
         spin_lock_bh(&orig_node->vlan_list_lock);
         hlist_for_each_entry_safe(vlan, node_tmp, &orig_node->vlan_list, list) {
                 hlist_del_rcu(&vlan->list);