bridge: multicast port group RCU fix
The recently introduced bridge mulitcast port group list was only
partially using RCU correctly. It was missing rcu_dereference()
and missing the necessary barrier on deletion.
The code should have used one of the standard list methods (list or hlist)
instead of open coding a RCU based link list.
Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/bridge/br_forward.c b/net/bridge/br_forward.c
index 5b70fc0..5f9988a 100644
--- a/net/bridge/br_forward.c
+++ b/net/bridge/br_forward.c
@@ -217,7 +217,7 @@
prev = NULL;
rp = rcu_dereference(br->router_list.first);
- p = mdst ? mdst->ports : NULL;
+ p = mdst ? rcu_dereference(mdst->ports) : NULL;
while (p || rp) {
lport = p ? p->port : NULL;
rport = rp ? hlist_entry(rp, struct net_bridge_port, rlist) :
@@ -231,7 +231,7 @@
goto out;
if ((unsigned long)lport >= (unsigned long)port)
- p = p->next;
+ p = rcu_dereference(p->next);
if ((unsigned long)rport >= (unsigned long)port)
rp = rcu_dereference(rp->next);
}