From e9dc86534051b78e41e5b746cccc291b57a3a311 Mon Sep 17 00:00:00 2001
From: "Eric W. Biederman" <ebiederm@xmission.com>
Date: Wed, 12 Sep 2007 13:02:17 +0200
Subject: [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>
---
 net/ipx/af_ipx.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'net/ipx')

diff --git a/net/ipx/af_ipx.c b/net/ipx/af_ipx.c
index f7b4d383c609..24921f12e9af 100644
--- a/net/ipx/af_ipx.c
+++ b/net/ipx/af_ipx.c
@@ -347,6 +347,9 @@ static int ipxitf_device_event(struct notifier_block *notifier,
 	struct net_device *dev = ptr;
 	struct ipx_interface *i, *tmp;
 
+	if (dev->nd_net != &init_net)
+		return NOTIFY_DONE;
+
 	if (event != NETDEV_DOWN && event != NETDEV_UP)
 		goto out;
 
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