[NET]: Make device event notification network namespace safe

Every user of the network device notifiers is either a protocol
stack or a pseudo device.  If a protocol stack that does not have
support for multiple network namespaces receives an event for a
device that is not in the initial network namespace it quite possibly
can get confused and do the wrong thing.

To avoid problems until all of the protocol stacks are converted
this patch modifies all netdev event handlers to ignore events on
devices that are not in the initial network namespace.

As the rest of the code is made network namespace aware these
checks can be removed.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 0 deletions

diff --git a/net/econet/af_econet.c b/net/econet/af_econet.c
index 7de3006af206..f877f3b5c725 100644
--- a/net/econet/af_econet.c
+++ b/net/econet/af_econet.c
@@ -1122,6 +1122,9 @@ static int econet_notifier(struct notifier_block *this, unsigned long msg, void
         struct net_device *dev = (struct net_device *)data;
         struct ec_device *edev;
 
+        if (dev->nd_net != &init_net)
+                return NOTIFY_DONE;
+
         switch (msg) {
         case NETDEV_UNREGISTER:
                 /* A device has gone down - kill any data we hold for it. */