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| author | Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp> | 2014-02-07 16:48:26 +0900 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-02-10 14:34:34 -0800 |
| commit | ac4c8868837a7c70ebb3eaf2298324a3b61b214e (patch) | |
| tree | 1f7410a566554747361af7b05c2a29b9ca83cccb /net/bridge | |
| parent | 424bb9c97cc1992018950485ca7410779b8ea21d (diff) | |
| download | lwn-ac4c8868837a7c70ebb3eaf2298324a3b61b214e.tar.gz lwn-ac4c8868837a7c70ebb3eaf2298324a3b61b214e.zip | |
bridge: Prevent possible race condition in br_fdb_change_mac_address
br_fdb_change_mac_address() calls fdb_insert()/fdb_delete() without
br->hash_lock.
These hash list updates are racy with br_fdb_update()/br_fdb_cleanup().
Signed-off-by: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp>
Acked-by: Vlad Yasevich <vyasevic@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/bridge')
| -rw-r--r-- | net/bridge/br_fdb.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c index 0426dff4b3fd..9203d5a1943f 100644 --- a/net/bridge/br_fdb.c +++ b/net/bridge/br_fdb.c @@ -191,6 +191,8 @@ void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr) struct net_port_vlans *pv; u16 vid = 0; + spin_lock_bh(&br->hash_lock); + /* If old entry was unassociated with any port, then delete it. */ f = __br_fdb_get(br, br->dev->dev_addr, 0); if (f && f->is_local && !f->dst) @@ -204,7 +206,7 @@ void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr) */ pv = br_get_vlan_info(br); if (!pv) - return; + goto out; for_each_set_bit_from(vid, pv->vlan_bitmap, VLAN_N_VID) { f = __br_fdb_get(br, br->dev->dev_addr, vid); @@ -212,6 +214,8 @@ void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr) fdb_delete_local(br, NULL, f); fdb_insert(br, NULL, newaddr, vid); } +out: + spin_unlock_bh(&br->hash_lock); } void br_fdb_cleanup(unsigned long _data) |