linux-kernel - Re: [regression] nf_iterate(), BUG: unable to handle kernel NULL pointer dereference

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Message-ID: <20080724125004.GA7426@gondor.apana.org.au>
Date:	Thu, 24 Jul 2008 20:50:04 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	Patrick McHardy <kaber@...sh.net>, Ingo Molnar <mingo@...e.hu>,
	David Miller <davem@...emloft.net>, w@....eu,
	davidn@...idnewall.com, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, stefanr@...6.in-berlin.de,
	rjw@...k.pl, ilpo.jarvinen@...sinki.fi,
	Dave Jones <davej@...hat.com>, Matt Mackall <mpm@...enic.com>,
	Christoph Lameter <cl@...ux-foundation.org>
Subject: Re: [regression] nf_iterate(), BUG: unable to handle kernel NULL pointer dereference

On Thu, Jul 24, 2008 at 03:40:40PM +0300, Pekka Enberg wrote:
>
> Using ksize() for skbs will crash your kernel for some configurations
> because calling that function for memory allocated with
> kmem_cache_alloc() is not supported by all the allocators (well,
> SLOB).

So how about fixing the interface so that it can return an error
to indicate that the allocator doesn't support it? You're taking
away an entire interface just because an underlying implementation
that's used by a very small proportion of users doesn't do the
right thing.

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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