bridge: vlan: Prevent possible use-after-free

When adding a port to a bridge we initialize VLAN filtering on it. We do
not bail out in case an error occurred in nbp_vlan_init, as it can be
used as a non VLAN filtering bridge.

However, if VLAN filtering is required and an error occurred in
nbp_vlan_init, we should set vlgrp to NULL, so that VLAN filtering
functions (e.g. br_vlan_find, br_get_pvid) will know the struct is
invalid and will not try to access it.
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/bridge/br_vlan.c

@@ -914,6 +914,8 @@ int nbp_vlan_init(struct net_bridge_port *p)
 	return ret;
 
 err_vlan_add:
+	RCU_INIT_POINTER(p->vlgrp, NULL);
+	synchronize_rcu();
 	rhashtable_destroy(&vg->vlan_hash);
 err_rhtbl:
 	kfree(vg);