netdev - Re: [PATCH 2/4 net-2.6.26] [IPV4]: Cleanup ip_options

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Date:	Mon, 03 Mar 2008 23:54:58 +0300
From:	"Denis V. Lunev" <den@...nvz.org>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH 2/4 net-2.6.26] [IPV4]: Cleanup ip_options_compile.

On Mon, 2008-03-03 at 11:55 -0800, David Miller wrote:
> From: "Denis V. Lunev" <den@...nvz.org>
> Date: Mon,  3 Mar 2008 18:48:41 +0300
> 
> > Right now ip_options_compile is called twice as (NULL, skb) and (opt, NULL).
> > So, let's move opt initialization into caller and remove this initialization
> > branch.
> > 
> > Additionally, the field ip_options->is_data becomes not needed. All decisions
> > should be made by the real skb availability.
> > 
> > Signed-off-by: Denis V. Lunev <den@...nvz.org>
> 
> I don't think this "is_data" elimination works.
> 
> Sometimes these option blobs come from the user or elsewhere.  And
> that's why we have to sometimes use opt->__data instead of the SKB
> embedded blob.
> 
> You also missed the is_data case in cipso_ipv4.c, so this wouldn't
> even compile.  Is there something wrong with "git grep" on your
> computer?

thanks for pointing this out.

Though, it seems to me, that this structure does not came from
userspace. At least I do not see a way for this. Could you show me how
this can happen?

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