From 410b3d48f5111a28bb8d4c3d3dc5984c1baf7fc9 Mon Sep 17 00:00:00 2001 From: Nikolay Aleksandrov Date: Mon, 13 Feb 2017 14:59:10 +0100 Subject: bridge: fdb: add proper lock checks in searching functions In order to avoid new errors add checks to br_fdb_find and fdb_find_rcu functions. The first requires hash_lock, the second obviously RCU. Signed-off-by: Nikolay Aleksandrov Signed-off-by: David S. Miller --- net/bridge/br_fdb.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'net/bridge/br_fdb.c') diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c index 04a53a0b733d..da5ed7d0a3c8 100644 --- a/net/bridge/br_fdb.c +++ b/net/bridge/br_fdb.c @@ -89,6 +89,8 @@ static struct net_bridge_fdb_entry *fdb_find_rcu(struct hlist_head *head, { struct net_bridge_fdb_entry *f; + WARN_ON_ONCE(!rcu_read_lock_held()); + hlist_for_each_entry_rcu(f, head, hlist) if (ether_addr_equal(f->addr.addr, addr) && f->vlan_id == vid) break; @@ -104,6 +106,8 @@ static struct net_bridge_fdb_entry *br_fdb_find(struct net_bridge *br, struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)]; struct net_bridge_fdb_entry *fdb; + WARN_ON_ONCE(!br_hash_lock_held(br)); + rcu_read_lock(); fdb = fdb_find_rcu(head, addr, vid); rcu_read_unlock(); -- cgit