Commit 6262971a authored by David S. Miller's avatar David S. Miller
Browse files

Merge tag 'batman-adv-fix-for-davem' of git://git.open-mesh.org/linux-merge 

Included changes:
- properly release neigh_ifinfo in batadv_iv_ogm_process_per_outif()
- properly release orig_ifinfo->router when freeing orig_ifinfo
- properly release neigh_node objects during periodic check
- properly release neigh_info objects when the related hard_iface
  is free'd

These changes are all very important because they fix some
reference counting imbalances that lead to the
impossibility of releasing the netdev object used by
batman-adv on shutdown.
The consequence is that such object cannot be destroyed by
the networking stack (the refcounter does not reach zero)
thus bringing the system in hanging state during a normal
reboot operation or a network reconfiguration.
parents 2176d5d4 709de13f

net/batman-adv/bat_iv_ogm.c

+2 −0
Original line number Diff line number Diff line
@@ -1545,6 +1545,8 @@ out_neigh: 
	if ((orig_neigh_node) && (!is_single_hop_neigh))

		batadv_orig_node_free_ref(orig_neigh_node);

out:

	if (router_ifinfo)

		batadv_neigh_ifinfo_free_ref(router_ifinfo);

	if (router)

		batadv_neigh_node_free_ref(router);

	if (router_router)

net/batman-adv/originator.c

+55 −4
Original line number Diff line number Diff line
@@ -501,12 +501,17 @@ batadv_neigh_node_get(const struct batadv_orig_node *orig_node, 
static void batadv_orig_ifinfo_free_rcu(struct rcu_head *rcu)

{

	struct batadv_orig_ifinfo *orig_ifinfo;

	struct batadv_neigh_node *router;



	orig_ifinfo = container_of(rcu, struct batadv_orig_ifinfo, rcu);



	if (orig_ifinfo->if_outgoing != BATADV_IF_DEFAULT)

		batadv_hardif_free_ref_now(orig_ifinfo->if_outgoing);



	/* this is the last reference to this object */

	router = rcu_dereference_protected(orig_ifinfo->router, true);

	if (router)

		batadv_neigh_node_free_ref_now(router);

	kfree(orig_ifinfo);

}
@@ -701,6 +706,47 @@ free_orig_node: 
	return NULL;

}



/**

 * batadv_purge_neigh_ifinfo - purge obsolete ifinfo entries from neighbor

 * @bat_priv: the bat priv with all the soft interface information

 * @neigh: orig node which is to be checked

 */

static void

batadv_purge_neigh_ifinfo(struct batadv_priv *bat_priv,

			  struct batadv_neigh_node *neigh)

{

	struct batadv_neigh_ifinfo *neigh_ifinfo;

	struct batadv_hard_iface *if_outgoing;

	struct hlist_node *node_tmp;



	spin_lock_bh(&neigh->ifinfo_lock);



	/* for all ifinfo objects for this neighinator */

	hlist_for_each_entry_safe(neigh_ifinfo, node_tmp,

				  &neigh->ifinfo_list, list) {

		if_outgoing = neigh_ifinfo->if_outgoing;



		/* always keep the default interface */

		if (if_outgoing == BATADV_IF_DEFAULT)

			continue;



		/* don't purge if the interface is not (going) down */

		if ((if_outgoing->if_status != BATADV_IF_INACTIVE) &&

		    (if_outgoing->if_status != BATADV_IF_NOT_IN_USE) &&

		    (if_outgoing->if_status != BATADV_IF_TO_BE_REMOVED))

			continue;



		batadv_dbg(BATADV_DBG_BATMAN, bat_priv,

			   "neighbor/ifinfo purge: neighbor %pM, iface: %s\n",

			   neigh->addr, if_outgoing->net_dev->name);



		hlist_del_rcu(&neigh_ifinfo->list);

		batadv_neigh_ifinfo_free_ref(neigh_ifinfo);

	}



	spin_unlock_bh(&neigh->ifinfo_lock);

}



/**

 * batadv_purge_orig_ifinfo - purge obsolete ifinfo entries from originator

 * @bat_priv: the bat priv with all the soft interface information
@@ -800,6 +846,11 @@ batadv_purge_orig_neighbors(struct batadv_priv *bat_priv, 


			hlist_del_rcu(&neigh_node->list);

			batadv_neigh_node_free_ref(neigh_node);

		} else {

			/* only necessary if not the whole neighbor is to be

			 * deleted, but some interface has been removed.

			 */

			batadv_purge_neigh_ifinfo(bat_priv, neigh_node);

		}

	}
@@ -857,7 +908,7 @@ static bool batadv_purge_orig_node(struct batadv_priv *bat_priv, 
{

	struct batadv_neigh_node *best_neigh_node;

	struct batadv_hard_iface *hard_iface;

	bool changed;

	bool changed_ifinfo, changed_neigh;



	if (batadv_has_timed_out(orig_node->last_seen,

				 2 * BATADV_PURGE_TIMEOUT)) {
@@ -867,10 +918,10 @@ static bool batadv_purge_orig_node(struct batadv_priv *bat_priv, 
			   jiffies_to_msecs(orig_node->last_seen));

		return true;

	}

	changed = batadv_purge_orig_ifinfo(bat_priv, orig_node);

	changed = changed || batadv_purge_orig_neighbors(bat_priv, orig_node);

	changed_ifinfo = batadv_purge_orig_ifinfo(bat_priv, orig_node);

	changed_neigh = batadv_purge_orig_neighbors(bat_priv, orig_node);



	if (!changed)

	if (!changed_ifinfo && !changed_neigh)

		return false;



	/* first for NULL ... */

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