[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>

3 files changed, 9 insertions, 0 deletions

diff --git a/drivers/net/wan/dlci.c b/drivers/net/wan/dlci.c
index 66be20c292b6..61041d5186ac 100644
--- a/drivers/net/wan/dlci.c
+++ b/drivers/net/wan/dlci.c
@@ -513,6 +513,9 @@ static int dlci_dev_event(struct notifier_block *unused,
 {
         struct net_device *dev = (struct net_device *) ptr;
 
+        if (dev->nd_net != &init_net)
+                return NOTIFY_DONE;
+
         if (event == NETDEV_UNREGISTER) {
                 struct dlci_local *dlp;
 
diff --git a/drivers/net/wan/hdlc.c b/drivers/net/wan/hdlc.c
index 3b57350eacca..ee23b91f23d9 100644
--- a/drivers/net/wan/hdlc.c
+++ b/drivers/net/wan/hdlc.c
@@ -109,6 +109,9 @@ static int hdlc_device_event(struct notifier_block *this, unsigned long event,
         unsigned long flags;
         int on;
  
+        if (dev->nd_net != &init_net)
+                return NOTIFY_DONE;
+
         if (dev->get_stats != hdlc_get_stats)
                 return NOTIFY_DONE; /* not an HDLC device */
  
diff --git a/drivers/net/wan/lapbether.c b/drivers/net/wan/lapbether.c
index ca8b3c3cb931..699b93406dfb 100644
--- a/drivers/net/wan/lapbether.c
+++ b/drivers/net/wan/lapbether.c
@@ -394,6 +394,9 @@ static int lapbeth_device_event(struct notifier_block *this,
         struct lapbethdev *lapbeth;
         struct net_device *dev = ptr;
 
+        if (dev->nd_net != &init_net)
+                return NOTIFY_DONE;
+
         if (!dev_is_ethdev(dev))
                 return NOTIFY_DONE;