Patch "rtnl/bond: don't send rtnl msg for unregistered iface" has been added to the 4.0-stable tree

This is a note to let you know that I've just added the patch titled

rtnl/bond: don't send rtnl msg for unregistered iface

to the 4.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
rtnl-bond-don-t-send-rtnl-msg-for-unregistered-iface.patch
and it can be found in the queue-4.0 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Nicolas Dichtel <[email protected]>
Date: Wed, 13 May 2015 14:19:42 +0200
Subject: rtnl/bond: don't send rtnl msg for unregistered iface

From: Nicolas Dichtel <[email protected]>

[ Upstream commit ed2a80ab7b76f11af0b2c6255709c4ebf164b667 ]

Before the patch, the command 'ip link add bond2 type bond mode 802.3ad' causes the kernel to send a rtnl message for the bond2 interface, with an ifindex 0.

'ip monitor' shows:
0: bond2: <BROADCAST,MULTICAST,MASTER> mtu 1500 state DOWN group default

    link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
9: bond2@NONE: <BROADCAST,MULTICAST,MASTER> mtu 1500 qdisc noop state DOWN group default
    link/ether ea:3e:1f:53:92:7b brd ff:ff:ff:ff:ff:ff

[snip]

The patch fixes the spotted bug by checking in bond driver if the interface is registered before calling the notifier chain.
It also adds a check in rtmsg_ifinfo() to prevent this kind of bug in the future.

---
 drivers/net/bonding/bond_options.c |    2 +-
 net/core/rtnetlink.c               |    3 +++
 2 files changed, 4 insertions(+), 1 deletion(-)

@@ -624,7 +624,7 @@ int __bond_opt_set(struct bonding *bond,
 out:
 	if (ret)
 		bond_opt_error_interpret(bond, opt, ret, val);
-	else
+	else if (bond->dev->reg_state == NETREG_REGISTERED)
 		call_netdevice_notifiers(NETDEV_CHANGEINFODATA, bond->dev);
 
 	return ret;

@@ -2337,6 +2337,9 @@ void rtmsg_ifinfo(int type, struct net_d
 {
 	struct sk_buff *skb;
 
+	if (dev->reg_state != NETREG_REGISTERED)
+		return;
+
 	skb = rtmsg_ifinfo_build_skb(type, dev, change, flags);
 	if (skb)
 		rtmsg_ifinfo_send(skb, dev, flags);

Patches currently in stable-queue which might be from [email protected] are

queue-4.0/rtnl-bond-don-t-send-rtnl-msg-for-unregistered-iface.patch