[PATCH 4.0 008/105] rtnl/bond: dont send rtnl msg for unregistered iface

From: Greg Kroah-Hartman
Date: Fri Jun 19 2015 - 17:18:06 EST

4.0-stable review patch. If anyone has any objections, please let me know.


From: Nicolas Dichtel <nicolas.dichtel@xxxxxxxxx>

[ 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

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

Fixes: d4261e565000 ("bonding: create netlink event when bonding option is changed")
CC: Jiri Pirko <jiri@xxxxxxxxxxx>
Reported-by: Julien Meunier <julien.meunier@xxxxxxxxx>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
drivers/net/bonding/bond_options.c | 2 +-
net/core/rtnetlink.c | 3 +++
2 files changed, 4 insertions(+), 1 deletion(-)

--- 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,
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;
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -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);

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