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| author | Nikolay Aleksandrov <nikolay@cumulusnetworks.com> | 2015-07-22 13:03:40 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-07-26 16:27:22 -0700 |
| commit | 963ad94853000ab100f5ff19eea80095660d41b4 (patch) | |
| tree | faa6faa5e27de62c37c0b30bcd96ed4158985be7 /net/bridge | |
| parent | 485164381c1d663d3be1c9d2c600be0fb80a68ad (diff) | |
| download | linux-963ad94853000ab100f5ff19eea80095660d41b4.tar.gz linux-963ad94853000ab100f5ff19eea80095660d41b4.tar.bz2 linux-963ad94853000ab100f5ff19eea80095660d41b4.zip | |
bridge: netlink: fix slave_changelink/br_setport race conditions
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>
Diffstat (limited to 'net/bridge')
| -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 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, |