netdev - Re: [PATCH] cls_u32: use skb_copy_bits() to dereference data safely

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Date:	Wed, 02 Jun 2010 09:47:06 -0400
From:	jamal <hadi@...erus.ca>
To:	David Miller <davem@...emloft.net>
Cc:	xiaosuo@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH] cls_u32: use skb_copy_bits() to dereference data safely

On Wed, 2010-06-02 at 06:43 -0700, David Miller wrote:
> From: jamal <hadi@...erus.ca>

> > 
> > A little worse than skb_copy_bits(). In any case, this change is going
> > to hurt.
> 
> Umm, Jamal what are you talking about?

;->

> Using skb_header_pointer(), if the offset is in range, there is no
> change from today other than a comparison.

Thats the part i glossed over - My eyes just saw "it calls
skb_copy_bits()" ;->

> If it is not in range, we use skb_copy_bits().  It's only for the
> case where we have to fetch the value from the fragmented part
> of the SKB.

cheers,
jamal

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