From: Nicolas Dichtel <nicolas.dichtel@xxxxxxxxx>
This patch has been added to the 3.18 stable tree. If you have any
objections, please let us know.
===============
[ 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.
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: Sasha Levin <sasha.levin@xxxxxxxxxx>
---
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 b62697f..f1c5394 100644
--- a/drivers/net/bonding/bond_options.c
+++ b/drivers/net/bonding/bond_options.c
@@ -625,7 +625,7 @@ 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 c522f7a..24d3242 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -2229,6 +2229,9 @@ void rtmsg_ifinfo(int type, struct net_device *dev, unsigned int change,
int err = -ENOBUFS;
size_t if_info_size;
+ if (dev->reg_state != NETREG_REGISTERED)
+ return;
+
skb = nlmsg_new((if_info_size = if_nlmsg_size(dev, 0)), flags);
if (skb == NULL)
goto errout;
--
2.1.0
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