[PATCH net v4] rtnl/bond: don't send rtnl msg for unregistered iface

[Nicolas Dichtel <nicolas.dichtel@6wind.com>]

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.

Fixes: d4261e565000 ("bonding: create netlink event when bonding option is changed")
CC: Jiri Pirko <jiri@resnulli.us>
Reported-by: Julien Meunier <julien.meunier@6wind.com>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
---

v4: keep the call to the notifier chain

v3: move reg_state check in rtmsg_ifinfo()

v2: check dev->reg_state instead of ifindex
    call rtmsg_ifinfo() directly in __bond_opt_set()

There is about 20 occurences of "dev->reg_state .= NETREG_REGISTERED".
I will send a patch on net-next to introduce an helper for this when net
will be merged with this patch in net-next.

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

diff --git a/drivers/net/bonding/bond_options.c b/drivers/net/bonding/bond_options.c
index 4df28943d222..e8d3c1d35453 100644
--- a/drivers/net/bonding/bond_options.c
+++ b/drivers/net/bonding/bond_options.c
@@ -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;
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 837d30b5ffed..7b25f1ef3d75 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -2415,6 +2415,9 @@ void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
 {
 	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);
-- 
2.2.2