From mboxrd@z Thu Jan 1 00:00:00 1970 From: Nicolas Dichtel Subject: [PATCH net v4] rtnl/bond: don't send rtnl msg for unregistered iface Date: Wed, 13 May 2015 14:19:42 +0200 Message-ID: <1431519582-4219-1-git-send-email-nicolas.dichtel@6wind.com> References: <20150512161402.GC2081@nanopsycho> Cc: davem@davemloft.net, netdev@vger.kernel.org, j.vosburgh@gmail.com, vfalico@gmail.com, gospo@cumulusnetworks.com, Nicolas Dichtel To: jiri@resnulli.us Return-path: Received: from 33.106-14-84.ripe.coltfrance.com ([84.14.106.33]:36443 "EHLO proxy.6wind.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933753AbbEMMTr (ORCPT ); Wed, 13 May 2015 08:19:47 -0400 In-Reply-To: <20150512161402.GC2081@nanopsycho> Sender: netdev-owner@vger.kernel.org List-ID: 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: mtu 1500 state DOWN group default link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff 9: bond2@NONE: 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 Reported-by: Julien Meunier Signed-off-by: Nicolas Dichtel --- 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