netdev - Re: [PATCH net-next v4] ipvlan: Initial check-in of the IPVLAN driver.

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Date:	Wed, 26 Nov 2014 09:05:41 -0800
From:	Mahesh Bandewar <maheshb@...gle.com>
To:	Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
Cc:	netdev <netdev@...r.kernel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	Maciej Zenczykowski <maze@...gle.com>,
	Laurent Chavey <chavey@...gle.com>,
	Tim Hockin <thockin@...gle.com>,
	David Miller <davem@...emloft.net>,
	Brandon Philips <brandon.philips@...eos.com>,
	Pavel Emelianov <xemul@...allels.com>
Subject: Re: [PATCH net-next v4] ipvlan: Initial check-in of the IPVLAN driver.

On Tue, Nov 25, 2014 at 10:41 PM, Toshiaki Makita
<makita.toshiaki@....ntt.co.jp> wrote:
> Hi Mahesh,
>
> I found that deleting the last ipvlan device triggers WARN_ON() in
> rtmsg_ifinfo().
> ipvlan_nl_fillinfo() seems to return -EINVAL in that case.
>
>> +static int ipvlan_nl_fillinfo(struct sk_buff *skb,
>> +                           const struct net_device *dev)
>> +{
>> +     struct ipvl_dev *ipvlan = netdev_priv(dev);
>> +     struct ipvl_port *port = ipvlan_port_get_rtnl(ipvlan->phy_dev);
>> +     int ret = -EINVAL;
>> +
>> +     if (!port)
>> +             goto err;
>> +
>> +     ret = -EMSGSIZE;
>> +     if (nla_put_u16(skb, IFLA_IPVLAN_MODE, port->mode))
>> +             goto err;
>> +
>> +     return 0;
>> +
>> +err:
>> +     return ret;
>> +}
>
> rollback_registered_many() calls rtmsg_ifinfo() after calling ndo_uninit().
> ndo_uninit() (ipvlan_uninit() -> ipvlan_port_destroy() ->
> netdev_rx_handler_unregister()) sets rx_handler_data into NULL.
> So, we cannot dereference "port" in ipvlan_nl_fillinfo().
>
Calling fillinfo() after calling uninit() seems pointless on any
device. But how are you hitting this case? Can you share the command
sequence with me?

Thanks,
--mahesh..

> Maybe "mode" should belong to struct ipvl_dev?
>
> Thanks,
> Toshiaki Makita
>
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