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Date:   Tue, 22 Sep 2020 01:07:09 +0300
From:   Vladimir Oltean <>
Subject: [PATCH net] net: bridge: br_vlan_get_pvid_rcu() should dereference the VLAN group under RCU

When calling the RCU brother of br_vlan_get_pvid(), lockdep warns:

WARNING: suspicious RCU usage
5.9.0-rc3-01631-g13c17acb8e38-dirty #814 Not tainted
net/bridge/br_private.h:1054 suspicious rcu_dereference_protected() usage!

Call trace:

The warning is because br_vlan_get_pvid_rcu() calls nbp_vlan_group()
which calls rtnl_dereference() instead of rcu_dereference(). In turn,
rtnl_dereference() calls rcu_dereference_protected() which assumes
operation under an RCU write-side critical section, which obviously is
not the case here. So, when the incorrect primitive is used to access
the RCU-protected VLAN group pointer, READ_ONCE() is not used, which may
cause various unexpected problems.

I'm sad to say that br_vlan_get_pvid() and br_vlan_get_pvid_rcu() cannot
share the same implementation. So fix the bug by splitting the 2
functions, and making br_vlan_get_pvid_rcu() retrieve the VLAN groups
under proper locking annotations.

Fixes: 7582f5b70f9a ("bridge: add br_vlan_get_pvid_rcu()")
Signed-off-by: Vladimir Oltean <>
 net/bridge/br_vlan.c | 27 +++++++++++++++++----------
 1 file changed, 17 insertions(+), 10 deletions(-)

diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c
index 199deb2adf60..002bbc93209d 100644
--- a/net/bridge/br_vlan.c
+++ b/net/bridge/br_vlan.c
@@ -1288,11 +1288,13 @@ void br_vlan_get_stats(const struct net_bridge_vlan *v,
-static int __br_vlan_get_pvid(const struct net_device *dev,
-			      struct net_bridge_port *p, u16 *p_pvid)
+int br_vlan_get_pvid(const struct net_device *dev, u16 *p_pvid)
 	struct net_bridge_vlan_group *vg;
+	struct net_bridge_port *p;
+	p = br_port_get_check_rtnl(dev);
 	if (p)
 		vg = nbp_vlan_group(p);
 	else if (netif_is_bridge_master(dev))
@@ -1303,18 +1305,23 @@ static int __br_vlan_get_pvid(const struct net_device *dev,
 	*p_pvid = br_get_pvid(vg);
 	return 0;
-int br_vlan_get_pvid(const struct net_device *dev, u16 *p_pvid)
-	return __br_vlan_get_pvid(dev, br_port_get_check_rtnl(dev), p_pvid);
 int br_vlan_get_pvid_rcu(const struct net_device *dev, u16 *p_pvid)
-	return __br_vlan_get_pvid(dev, br_port_get_check_rcu(dev), p_pvid);
+	struct net_bridge_vlan_group *vg;
+	struct net_bridge_port *p;
+	p = br_port_get_check_rcu(dev);
+	if (p)
+		vg = nbp_vlan_group_rcu(p);
+	else if (netif_is_bridge_master(dev))
+		vg = br_vlan_group_rcu(netdev_priv(dev));
+	else
+		return -EINVAL;
+	*p_pvid = br_get_pvid(vg);
+	return 0;

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