netdev - Re: [Devel] [PATCH 1/2] netns: fix NULL-dereference in dev

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Message-ID: <20080814195537.GA8214@martell.zuzino.mipt.ru>
Date:	Thu, 14 Aug 2008 23:55:37 +0400
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Brian Haley <brian.haley@...com>
Cc:	David Miller <davem@...emloft.net>,
	containers <containers@...ts.osdl.org>, netdev@...r.kernel.org
Subject: Re: [Devel] [PATCH 1/2] netns: fix NULL-dereference in dev_net()

On Thu, Aug 14, 2008 at 03:27:25PM -0400, Brian Haley wrote:
> Change dev_net() to handle a NULL argument - return &init_net instead.

> --- a/include/linux/netdevice.h
> +++ b/include/linux/netdevice.h
> @@ -781,10 +781,10 @@ static inline
>  struct net *dev_net(const struct net_device *dev)
>  {
>  #ifdef CONFIG_NET_NS
> -	return dev->nd_net;
> -#else
> -	return &init_net;
> +	if (dev)
> +		return dev->nd_net;
>  #endif
> +	return &init_net;
>  }

This is ugly and wrong.

The only assymetry between init_net and dynamically created netns is
that some data structures are created only when init_net is initialized
like some kmem caches and so on.

And some sysctls that some people may ban in netns.

Modulo that, init_net is no different from the rest.

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