netdev - [PATCH net] bridge: netlink: fix slave_changelink/br

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Message-Id: <1437563020-23506-1-git-send-email-razor@blackwall.org>
Date:	Wed, 22 Jul 2015 13:03:40 +0200
From:	Nikolay Aleksandrov <razor@...ckwall.org>
To:	netdev@...r.kernel.org
Cc:	jiri@...nulli.us, davem@...emloft.net,
	bridge@...ts.linux-foundation.org, stephen@...workplumber.org,
	Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
Subject: [PATCH net] bridge: netlink: fix slave_changelink/br_setport race conditions

From: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>

Since slave_changelink support was added there have been a few race
conditions when using br_setport() since some of the port functions it
uses require the bridge lock. It is very easy to trigger a lockup due to
some internal spin_lock() usage without bh disabled, also it's possible to
get the bridge into an inconsistent state.

Signed-off-by: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
Fixes: 3ac636b8591c ("bridge: implement rtnl_link_ops->slave_changelink")
---
 net/bridge/br_netlink.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index 364bdc98bd9b..3da5525eb8a2 100644
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -693,9 +693,17 @@ static int br_port_slave_changelink(struct net_device *brdev,
 				    struct nlattr *tb[],
 				    struct nlattr *data[])
 {
+	struct net_bridge *br = netdev_priv(brdev);
+	int ret;
+
 	if (!data)
 		return 0;
-	return br_setport(br_port_get_rtnl(dev), data);
+
+	spin_lock_bh(&br->lock);
+	ret = br_setport(br_port_get_rtnl(dev), data);
+	spin_unlock_bh(&br->lock);
+
+	return ret;
 }
 
 static int br_port_fill_slave_info(struct sk_buff *skb,
-- 
2.4.3

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