batman-adv: Only put gw_node list reference when removed

The batadv_gw_node reference counter in batadv_gw_node_update can only be
reduced when the list entry was actually removed. Otherwise the reference
counter may reach zero when batadv_gw_node_update is called from two
different contexts for the same gw_node but only one context is actually
removing the entry from the list.

The release function for this gw_node is not called inside the list_lock
spinlock protected region because the function batadv_gw_node_update still
holds a gw_node reference for the object pointer on the stack. Thus the
actual release function (when required) will be called only at the end of
the function.

Fixes: bd3524c14bd0 ("batman-adv: remove obsolete deleted attribute for gateway node")
Signed-off-by: Sven Eckelmann <[email protected]>
Signed-off-by: Marek Lindner <[email protected]>
Signed-off-by: Antonio Quartulli <[email protected]>

diff --git a/net/batman-adv/gateway_client.c b/net/batman-adv/gateway_client.c
index e6c8382c79ba86dfea5078a37f692f74ebffb01c..ccf70bed0d0cc0c8636d21ba7f8508bbbf9cd4e7 100644 (file)
--- a/net/batman-adv/gateway_client.c
+++ b/net/batman-adv/gateway_client.c
@@ -527,11 +527,12 @@ void batadv_gw_node_update(struct batadv_priv *bat_priv,
                 * gets dereferenced.
                 */
                spin_lock_bh(&bat_priv->gw.list_lock);
-               hlist_del_init_rcu(&gw_node->list);
+               if (!hlist_unhashed(&gw_node->list)) {
+                       hlist_del_init_rcu(&gw_node->list);
+                       batadv_gw_node_free_ref(gw_node);
+               }
                spin_unlock_bh(&bat_priv->gw.list_lock);
 
-               batadv_gw_node_free_ref(gw_node);
-
                curr_gw = batadv_gw_get_selected_gw_node(bat_priv);
                if (gw_node == curr_gw)
                        batadv_gw_reselect(bat_priv);