[Bridge] [PATCH net] bridge: netlink: fix slave_changelink/br_setport race conditions

Nikolay Aleksandrov razor at blackwall.org
Wed Jul 22 11:03:40 UTC 2015

From: Nikolay Aleksandrov <nikolay at cumulusnetworks.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 at cumulusnetworks.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,

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