[VLAN]: Fix promiscous/allmulti synchronization races

The set_multicast_list function may be called without holding the rtnl
mutex, resulting in races when changing the underlying device's promiscous
and allmulti state. Use the change_rx_mode hook, which is always invoked
under the rtnl.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 0 deletions

diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c
index abb9900edb3f..39bdcc25c150 100644
--- a/net/8021q/vlan.c
+++ b/net/8021q/vlan.c
@@ -373,6 +373,7 @@ void vlan_setup(struct net_device *new_dev)
         new_dev->open = vlan_dev_open;
         new_dev->stop = vlan_dev_stop;
         new_dev->set_multicast_list = vlan_dev_set_multicast_list;
+        new_dev->change_rx_flags = vlan_change_rx_flags;
         new_dev->destructor = free_netdev;
         new_dev->do_ioctl = vlan_dev_ioctl;