netdev - Re: [PATCH net-next] net: vxlan: do not use vxlan

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Date:	Mon, 20 Jan 2014 23:01:47 +0100
From:	Daniel Borkmann <dborkman@...hat.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	davem@...emloft.net, netdev@...r.kernel.org,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Cong Wang <xiyou.wangcong@...il.com>
Subject: Re: [PATCH net-next] net: vxlan: do not use vxlan_net before checking
 event type

On 01/20/2014 10:51 PM, Eric W. Biederman wrote:
...
> I am not going to argue against this patch as an immediate bug fix but
> something smells here, that bears deeper investigation.  It looks like
> the symptom is being patched rather than the actual problem.
>
> In particular net_generic(dev_net(dev), vxlan_net_id) is valid at the
> point that it is being called.  As the pointers are allocated in
> copy_net_ns in net_alloc prior to setup_net being called.
>
> On the flip side it is the responsibility of code that uses both
> register_netdev_notifier and register_pernet_xxx to be ready to handle
> events from any namespace as soon as they happen.  vxlan should be using
> register_pernet_subsys instead of register_pernet_device to ensure the
> vxlan_net structure is initialized before and cleaned up after all
> network devices in a given network namespace.  The vlan devices with a
> similar problem already do this.
>
> So in summary.  Something smells and I don't believe this patch fixes
> the underlying issue.  Please take a deeper look into what vxlan is doing.

Thanks for the input Eric!

If no-one is faster than me, I'll try to look into it soon.
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