linux-kernel - [132/143] Phonet: device notifier only runs on initial namespace

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Date:	Thu, 05 May 2011 17:21:57 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	RÃ©mi Denis-Courmont 
	<remi.denis-courmont@...ia.com>
Subject: [132/143] Phonet: device notifier only runs on initial namespace

2.6.32-longterm review patch.  If anyone has any objections, please let us know.

------------------

[bwh: This is only applicable to 2.6.32. Phonet was fixed upstream to
work with multiple net namespaces.]

This should really fix the OOPS when doing:

  unshare(CLONE_NEWNET);
  exit(0);

while the phonet module is loaded.

Signed-off-by: Rémi Denis-Courmont <remi.denis-courmont@...ia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 net/phonet/pn_dev.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/net/phonet/pn_dev.c
+++ b/net/phonet/pn_dev.c
@@ -225,6 +225,9 @@ static int phonet_device_notify(struct n
 {
 	struct net_device *dev = arg;
 
+	if (!net_eq(dev_net(dev), &init_net))
+		return 0;
+
 	switch (what) {
 	case NETDEV_REGISTER:
 		if (dev->type == ARPHRD_PHONET)


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