diff options
| author | Johannes Berg <johannes.berg@intel.com> | 2015-03-03 16:02:16 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-03-04 00:20:22 -0500 |
| commit | 2f56f6be47dbc6883e28107edfe2f9f98f4d5a24 (patch) | |
| tree | 8f9f700566913bc2e0bc09d00ecee9eac492f31e | |
| parent | 71a83a6db6138b9d41d8a0b6b91cb59f6dc4742c (diff) | |
| download | linux-2f56f6be47dbc6883e28107edfe2f9f98f4d5a24.tar.bz2 | |
bridge: fix bridge netlink RCU usage
When the STP timer fires, it can call br_ifinfo_notify(),
which in turn ends up in the new br_get_link_af_size().
This function is annotated to be using RTNL locking, which
clearly isn't the case here, and thus lockdep warns:
===============================
[ INFO: suspicious RCU usage. ]
3.19.0+ #569 Not tainted
-------------------------------
net/bridge/br_private.h:204 suspicious rcu_dereference_protected() usage!
Fix this by doing RCU locking here.
Fixes: b7853d73e39b ("bridge: add vlan info to bridge setlink and dellink notification messages")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Acked-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/bridge/br_netlink.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c index 3de0eefe2b82..c72083968768 100644 --- a/net/bridge/br_netlink.c +++ b/net/bridge/br_netlink.c @@ -81,17 +81,19 @@ static size_t br_get_link_af_size_filtered(const struct net_device *dev, struct net_port_vlans *pv; int num_vlan_infos; + rcu_read_lock(); if (br_port_exists(dev)) - pv = nbp_get_vlan_info(br_port_get_rtnl(dev)); + pv = nbp_get_vlan_info(br_port_get_rcu(dev)); else if (dev->priv_flags & IFF_EBRIDGE) pv = br_get_vlan_info((struct net_bridge *)netdev_priv(dev)); else - return 0; - - if (!pv) - return 0; + pv = NULL; + if (pv) + num_vlan_infos = br_get_num_vlan_infos(pv, filter_mask); + else + num_vlan_infos = 0; + rcu_read_unlock(); - num_vlan_infos = br_get_num_vlan_infos(pv, filter_mask); if (!num_vlan_infos) return 0; |