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

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The backbone_gw 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>
This commit is contained in:
Marek Lindner 2018-09-07 05:45:54 +08:00 • committed by Simon Wunderlich
parent ae3cdc97dc
commit 5af96b9c59
1 changed files with 8 additions and 2 deletions
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10
net/batman-adv/bridge_loop_avoidance.c
View file

@ -1772,6 +1772,7 @@ batadv_bla_loopdetect_check(struct batadv_priv *bat_priv, struct sk_buff *skb,
{ {
struct batadv_bla_backbone_gw *backbone_gw; struct batadv_bla_backbone_gw *backbone_gw;
struct ethhdr *ethhdr; struct ethhdr *ethhdr;
bool ret;
ethhdr = eth_hdr(skb); ethhdr = eth_hdr(skb);
@ -1795,8 +1796,13 @@ batadv_bla_loopdetect_check(struct batadv_priv *bat_priv, struct sk_buff *skb,
if (unlikely(!backbone_gw)) if (unlikely(!backbone_gw))
return true; return true;
queue_work(batadv_event_workqueue, &backbone_gw->report_work); ret = queue_work(batadv_event_workqueue, &backbone_gw->report_work);
/* backbone_gw is unreferenced in the report work function function */
/* backbone_gw is unreferenced in the report work function function
* if queue_work() call was successful
*/
if (!ret)
batadv_backbone_gw_put(backbone_gw);
return true; return true;
} }