From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH]IPv6:remove duplicate check of optlen when setsockopt
 with IPV6_PKTINFO option
Date: Wed, 14 Jan 2009 21:45:21 -0800 (PST)
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From: Herbert Xu <herbert@gondor.apana.org.au>
Date: Thu, 15 Jan 2009 16:37:02 +1100

> On Thu, Jan 15, 2009 at 01:34:03PM +0800, Yang Hongyang wrote:
> > 
> > Dave,there are some of the code elsewhere return EFAULT when
> > optval=NULL,I will post a patch to fix them:)
> 
> I disagree.  The concept of a user-space NULL pointer is different
> to that of a kernel-space NULL pointer, so the kernel should not
> be treating a user-space NULL pointer differently than any other
> pointer.

I agree with Herbert, but of course we have to adhere to cases
where APIs actually define a user NULL pointer to have a specific
meaning.