macvlan: Don't propagate IFF_ALLMULTI changes on down interfaces.

[ Upstream commit bbeb0eadcf9fe74fb2b9b1a6fea82cd538b1e556 ]

Clearing the IFF_ALLMULTI flag on a down interface could cause an allmulti
overflow on the underlying interface.

Attempting the set IFF_ALLMULTI on the underlying interface would cause an
error and the log message:

"allmulti touches root, set allmulti failed."

Signed-off-by: Peter Christensen <pch@ordbogen.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index ab5786b..b74cdf6 100644 (file)
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -391,8 +391,10 @@ static void macvlan_change_rx_flags(struct net_device *dev, int change)
        struct macvlan_dev *vlan = netdev_priv(dev);
        struct net_device *lowerdev = vlan->lowerdev;
 
-       if (change & IFF_ALLMULTI)
-               dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
+       if (dev->flags & IFF_UP) {
+               if (change & IFF_ALLMULTI)
+                       dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
+       }
 }
 
 static void macvlan_set_multicast_list(struct net_device *dev)