[B.A.T.M.A.N.] [PATCH maint 1/2] batman-adv: fix backbone_gw refcount on queue_work() failure

[Marek Lindner]

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 <mareklind...@neomailbox.ch>
---
 net/batman-adv/bridge_loop_avoidance.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/net/batman-adv/bridge_loop_avoidance.c 
b/net/batman-adv/bridge_loop_avoidance.c
index a2de5a44..58c093ca 100644
--- a/net/batman-adv/bridge_loop_avoidance.c
+++ b/net/batman-adv/bridge_loop_avoidance.c
@@ -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 ethhdr *ethhdr;
+       bool ret;
 
        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))
                return true;
 
-       queue_work(batadv_event_workqueue, &backbone_gw->report_work);
-       /* backbone_gw is unreferenced in the report work function function */
+       ret = queue_work(batadv_event_workqueue, &backbone_gw->report_work);
+
+       /* 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;
 }
-- 
2.18.0