The following commit has been merged in the master branch: commit 936523441bb64cdc9a5b263e8fd2782e70313a57 Author: Sven Eckelmann sven@narfation.org Date: Sat Aug 6 15:50:52 2016 +0200

batman-adv: Add missing refcnt for last_candidate

batadv_find_router dereferences last_bonding_candidate from orig_node without making sure that it has a valid reference. This reference has to be retrieved by increasing the reference counter while holding neigh_list_lock. The lock is required to avoid that batadv_last_bonding_replace removes the current last_bonding_candidate, reduces the reference counter and maybe destroys the object in this process.

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

diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c index 7602c00..3d19947 100644 --- a/net/batman-adv/routing.c +++ b/net/batman-adv/routing.c @@ -470,6 +470,29 @@ static int batadv_check_unicast_packet(struct batadv_priv *bat_priv, }

/** + * batadv_last_bonding_get - Get last_bonding_candidate of orig_node + * @orig_node: originator node whose last bonding candidate should be retrieved + * + * Return: last bonding candidate of router or NULL if not found + * + * The object is returned with refcounter increased by 1. + */ +static struct batadv_orig_ifinfo * +batadv_last_bonding_get(struct batadv_orig_node *orig_node) +{ + struct batadv_orig_ifinfo *last_bonding_candidate; + + spin_lock_bh(&orig_node->neigh_list_lock); + last_bonding_candidate = orig_node->last_bonding_candidate; + + if (last_bonding_candidate) + kref_get(&last_bonding_candidate->refcount); + spin_unlock_bh(&orig_node->neigh_list_lock); + + return last_bonding_candidate; +} + +/** * batadv_last_bonding_replace - Replace last_bonding_candidate of orig_node * @orig_node: originator node whose bonding candidates should be replaced * @new_candidate: new bonding candidate or NULL @@ -539,7 +562,7 @@ batadv_find_router(struct batadv_priv *bat_priv, * router - obviously there are no other candidates. */ rcu_read_lock(); - last_candidate = orig_node->last_bonding_candidate; + last_candidate = batadv_last_bonding_get(orig_node); if (last_candidate) last_cand_router = rcu_dereference(last_candidate->router);

@@ -631,6 +654,9 @@ next: batadv_orig_ifinfo_put(next_candidate); }

+ if (last_candidate) + batadv_orig_ifinfo_put(last_candidate); + return router; }