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authorJohannes Berg <johannes.berg@intel.com>2015-03-03 16:02:16 +0100
committerDavid S. Miller <davem@davemloft.net>2015-03-04 00:20:22 -0500
commit2f56f6be47dbc6883e28107edfe2f9f98f4d5a24 (patch)
tree8f9f700566913bc2e0bc09d00ecee9eac492f31e /net/bridge
parent71a83a6db6138b9d41d8a0b6b91cb59f6dc4742c (diff)
downloadlinux-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>
Diffstat (limited to 'net/bridge')
-rw-r--r--net/bridge/br_netlink.c14
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;