diff options
| author | Nikolay Aleksandrov <nikolay@cumulusnetworks.com> | 2015-07-22 13:03:40 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-09-29 19:26:24 +0200 |
| commit | 90ec7452b5804da4e0a0041e25c4ee74e06578db (patch) | |
| tree | 74ab9c1e623cc0340b5b740d5c5f4d0fe9e61bb1 | |
| parent | 51677b722338da3671ef19846616cf3811253760 (diff) | |
bridge: netlink: fix slave_changelink/br_setport race conditions
[ Upstream commit 963ad94853000ab100f5ff19eea80095660d41b4 ]
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@cumulusnetworks.com>
Fixes: 3ac636b8591c ("bridge: implement rtnl_link_ops->slave_changelink")
Reviewed-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | net/bridge/br_netlink.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c index 4b5c236998ff..20e06a9a1820 100644 --- a/net/bridge/br_netlink.c +++ b/net/bridge/br_netlink.c @@ -711,9 +711,17 @@ 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, |