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bridge: fix bridge netlink RCU usage

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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>
This commit is contained in:
Johannes Berg 2015-03-03 16:02:16 +01:00 committed by David S. Miller
parent 71a83a6db6
commit 2f56f6be47
1 changed files with 8 additions and 6 deletions
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14
net/bridge/br_netlink.c
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@ -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;
pv = NULL;
if (pv)
num_vlan_infos = br_get_num_vlan_infos(pv, filter_mask);
else
num_vlan_infos = 0;
rcu_read_unlock();
if (!pv)
return 0;
num_vlan_infos = br_get_num_vlan_infos(pv, filter_mask);
if (!num_vlan_infos)
return 0;