ipvlan: protect against concurrent link removal

Adding and removing to the 'ipvlans' list is already done using _rcu list
operations.

Signed-off-by: Jiri Benc <jbenc@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ipvlan/ipvlan_core.c b/drivers/net/ipvlan/ipvlan_core.c
index 8a542b9..568628f 100644 (file)
--- a/drivers/net/ipvlan/ipvlan_core.c
+++ b/drivers/net/ipvlan/ipvlan_core.c
@@ -193,7 +193,8 @@ static void ipvlan_multicast_frame(struct ipvl_port *port, struct sk_buff *skb,
        if (skb->protocol == htons(ETH_P_PAUSE))
                return;
 
-       list_for_each_entry(ipvlan, &port->ipvlans, pnode) {
+       rcu_read_lock();
+       list_for_each_entry_rcu(ipvlan, &port->ipvlans, pnode) {
                if (local && (ipvlan == in_dev))
                        continue;
 
@@ -220,6 +221,7 @@ static void ipvlan_multicast_frame(struct ipvl_port *port, struct sk_buff *skb,
 mcast_acct:
                ipvlan_count_rx(ipvlan, len, ret == NET_RX_SUCCESS, true);
        }
+       rcu_read_unlock();
 
        /* Locally generated? ...Forward a copy to the main-device as
         * well. On the RX side we'll ignore it (wont give it to any