bridge: netlink: fix slave_changelink/br_setport race conditions

[deliverable/linux.git] / net / bridge / br_netlink.c

diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index 364bdc98bd9bef003dfe4f17a1f2ac3048c0bd02..3da5525eb8a2dc21e5f64638881a351a72a0d300 100644 (file)
--- 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,