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batman-adv: fix hardif_neigh refcount on queue_work() failure

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[ 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>
This commit is contained in:
Marek Lindner 2018-09-07 05:45:55 +08:00 committed by Greg Kroah-Hartman
parent 3e9f714fb5
commit 498c536f59
1 changed files with 6 additions and 2 deletions
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8
net/batman-adv/bat_v_elp.c
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@ -254,6 +254,7 @@ static void batadv_v_elp_periodic_work(struct work_struct *work)
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);
@ -315,8 +316,11 @@ static void batadv_v_elp_periodic_work(struct work_struct *work)
* 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();