netdev - [PATCH 4/4] batman-adv: initialize up/down values when adding a gateway

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Message-Id: <1438779107-12665-5-git-send-email-antonio@meshcoding.com>
Date:	Wed,  5 Aug 2015 14:51:47 +0200
From:	Antonio Quartulli <antonio@...hcoding.com>
To:	davem@...emloft.net
Cc:	netdev@...r.kernel.org, b.a.t.m.a.n@...ts.open-mesh.org,
	Simon Wunderlich <simon@...n-mesh.com>,
	Marek Lindner <mareklindner@...mailbox.ch>,
	Antonio Quartulli <antonio@...hcoding.com>
Subject: [PATCH 4/4] batman-adv: initialize up/down values when adding a gateway

From: Simon Wunderlich <simon@...n-mesh.com>

Without this initialization, gateways which actually announce up/down
bandwidth of 0/0 could be added. If these nodes get purged via
_batadv_purge_orig() later, the gw_node structure does not get removed
since batadv_gw_node_delete() updates the gw_node with up/down
bandwidth of 0/0, and the updating function then discards the change
and does not free gw_node.

This results in leaking the gw_node structures, which references other
structures: gw_node -> orig_node -> orig_node_ifinfo -> hardif. When
removing the interface later, the open reference on the hardif may cause
hangs with the infamous "unregister_netdevice: waiting for mesh1 to
become free. Usage count = 1" message.

Signed-off-by: Simon Wunderlich <simon@...n-mesh.com>
Signed-off-by: Marek Lindner <mareklindner@...mailbox.ch>
Signed-off-by: Antonio Quartulli <antonio@...hcoding.com>
---
 net/batman-adv/gateway_client.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/batman-adv/gateway_client.c b/net/batman-adv/gateway_client.c
index bb015862..cffa92d 100644
--- a/net/batman-adv/gateway_client.c
+++ b/net/batman-adv/gateway_client.c
@@ -439,6 +439,8 @@ static void batadv_gw_node_add(struct batadv_priv *bat_priv,

 	INIT_HLIST_NODE(&gw_node->list);
 	gw_node->orig_node = orig_node;
+	gw_node->bandwidth_down = ntohl(gateway->bandwidth_down);
+	gw_node->bandwidth_up = ntohl(gateway->bandwidth_up);
 	atomic_set(&gw_node->refcount, 1);

 	spin_lock_bh(&bat_priv->gw.list_lock);
-- 
2.5.0

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