The following commit has been merged in the merge/master branch: commit 439030821e5db7241857e3eaebb4263562e5c615 Author: Sven Eckelmann sven@narfation.org Date: Sat Mar 5 19:05:24 2016 +0100

batman-adv: Use kref_get for _batadv_update_route

_batadv_update_route requires that the caller already has a valid reference for neigh_node. It is therefore not possible that it has an reference counter of 0 and was still given to this function

The kref_get function instead WARNs (with debug information) when the reference counter would still be 0. This makes a bug in batman-adv better visible because kref_get_unless_zero would have ignored this problem.

Signed-off-by: Sven Eckelmann sven@narfation.org Signed-off-by: Marek Lindner mareklindner@neomailbox.ch

diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c index 94b4356..ae850f2 100644 --- a/net/batman-adv/routing.c +++ b/net/batman-adv/routing.c @@ -100,10 +100,6 @@ static void _batadv_update_route(struct batadv_priv *bat_priv, if (curr_router) batadv_neigh_node_put(curr_router);

- /* increase refcount of new best neighbor */ - if (neigh_node && !kref_get_unless_zero(&neigh_node->refcount)) - neigh_node = NULL; - spin_lock_bh(&orig_node->neigh_list_lock); /* curr_router used earlier may not be the current orig_ifinfo->router * anymore because it was dereferenced outside of the neigh_list_lock @@ -114,6 +110,10 @@ static void _batadv_update_route(struct batadv_priv *bat_priv, */ curr_router = rcu_dereference_protected(orig_ifinfo->router, true);

+ /* increase refcount of new best neighbor */ + if (neigh_node) + kref_get(&neigh_node->refcount); + rcu_assign_pointer(orig_ifinfo->router, neigh_node); spin_unlock_bh(&orig_node->neigh_list_lock); batadv_orig_ifinfo_put(orig_ifinfo);