[NET]: Make packet reception network namespace safe

This patch modifies every packet receive function
registered with dev_add_pack() to drop packets if they
are not from the initial network namespace.

This should ensure that the various network stacks do
not receive packets in a anything but the initial network
namespace until the code has been converted and is ready
for them.

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/irda/irlap_frame.c b/net/irda/irlap_frame.c
index 25a3444a9234..77ac27e81161 100644
--- a/net/irda/irlap_frame.c
+++ b/net/irda/irlap_frame.c
@@ -1326,6 +1326,9 @@ int irlap_driver_rcv(struct sk_buff *skb, struct net_device *dev,
         int command;
         __u8 control;
 
+        if (dev->nd_net != &init_net)
+                goto out;
+
         /* FIXME: should we get our own field? */
         self = (struct irlap_cb *) dev->atalk_ptr;