netdev - [PATCH net-next] net: bridge: Lock before br_fdb

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Message-Id: <ff84c00d882dc646a7d69dcbdfe8417b4c0bdf91.1527522008.git.petrm@mellanox.com>
Date:   Mon, 28 May 2018 17:44:16 +0200
From:   Petr Machata <petrm@...lanox.com>
To:     bridge@...ts.linux-foundation.org, netdev@...r.kernel.org
Cc:     stephen@...workplumber.org, davem@...emloft.net
Subject: [PATCH net-next] net: bridge: Lock before br_fdb_find()

Callers of br_fdb_find() need to hold the hash lock, which
br_fdb_find_port() doesn't do. Add the missing lock/unlock
pair.

Signed-off-by: Petr Machata <petrm@...lanox.com>
---
 net/bridge/br_fdb.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c
index b19e310..3f5691a 100644
--- a/net/bridge/br_fdb.c
+++ b/net/bridge/br_fdb.c
@@ -135,9 +135,11 @@ struct net_device *br_fdb_find_port(const struct net_device *br_dev,
 		return NULL;
 
 	br = netdev_priv(br_dev);
+	spin_lock_bh(&br->hash_lock);
 	f = br_fdb_find(br, addr, vid);
 	if (f && f->dst)
 		dev = f->dst->dev;
+	spin_unlock_bh(&br->hash_lock);
 
 	return dev;
 }
-- 
2.4.11