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bridge: Fix VLAN reference count problem

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[ Upstream commit 0e5a82efda ]

When a VLAN is added on a port, a reference is taken on the
corresponding master VLAN entry. If it does not already exist, then it
is created and a reference taken.

However, in the second case a reference is not really taken when
CONFIG_REFCOUNT_FULL is enabled as refcount_inc() is replaced by
refcount_inc_not_zero().

Fix this by using refcount_set() on a newly created master VLAN entry.

Fixes: 2512775985 ("net, bridge: convert net_bridge_vlan.refcnt from atomic_t to refcount_t")
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Acked-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ido Schimmel 2018-02-25 21:59:06 +02:00 committed by Greg Kroah-Hartman
parent 00ec3b0ca3
commit cbd173b810
1 changed files with 2 additions and 0 deletions
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2
net/bridge/br_vlan.c
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@ -157,6 +157,8 @@ static struct net_bridge_vlan *br_vlan_get_master(struct net_bridge *br, u16 vid
masterv = br_vlan_find(vg, vid);
if (WARN_ON(!masterv))
return NULL;
refcount_set(&masterv->refcnt, 1);
return masterv;
}
refcount_inc(&masterv->refcnt);