4.9-stable review patch. If anyone has any objections, please let me know.
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From: Marek Lindner mareklindner@neomailbox.ch
[ Upstream commit 4c4af6900844ab04c9434c972021d7b48610e06a ]
The hardif_neigh refcounter is to be decreased by the queued work and currently is never decreased if the queue_work() call fails. Fix by checking the queue_work() return value and decrease refcount if necessary.
Signed-off-by: Marek Lindner mareklindner@neomailbox.ch Signed-off-by: Sven Eckelmann sven@narfation.org Signed-off-by: Simon Wunderlich sw@simonwunderlich.de Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/batman-adv/bat_v_elp.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
--- a/net/batman-adv/bat_v_elp.c +++ b/net/batman-adv/bat_v_elp.c @@ -243,6 +243,7 @@ static void batadv_v_elp_periodic_work(s struct batadv_priv *bat_priv; struct sk_buff *skb; u32 elp_interval; + bool ret;
bat_v = container_of(work, struct batadv_hard_iface_bat_v, elp_wq.work); hard_iface = container_of(bat_v, struct batadv_hard_iface, bat_v); @@ -304,8 +305,11 @@ static void batadv_v_elp_periodic_work(s * may sleep and that is not allowed in an rcu protected * context. Therefore schedule a task for that. */ - queue_work(batadv_event_workqueue, - &hardif_neigh->bat_v.metric_work); + ret = queue_work(batadv_event_workqueue, + &hardif_neigh->bat_v.metric_work); + + if (!ret) + batadv_hardif_neigh_put(hardif_neigh); } rcu_read_unlock();