netdev - Re: [PATCH]IPv6:remove duplicate check of optlen when setsockopt with IPV6

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Message-ID: <20090115050638.GA30224@gondor.apana.org.au>
Date:	Thu, 15 Jan 2009 16:06:38 +1100
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	David Miller <davem@...emloft.net>
Cc:	yanghy@...fujitsu.com, netdev@...r.kernel.org
Subject: Re: [PATCH]IPv6:remove duplicate check of optlen when setsockopt
	with IPV6_PKTINFO option

On Thu, Jan 15, 2009 at 04:04:49PM +1100, Herbert Xu wrote:
> On Wed, Jan 14, 2009 at 09:02:42PM -0800, David Miller wrote:
> >
> > Actually, we return EINVAL just a few lines above this code
> > block for some other socket option cases when optval==NULL.
> 
> Well the very next option IPV6_2292PKTOPTIONS returns EFAULT
> by virtue of not explicitly checking optval == NULL :)

In fact checking for a NULL pointer is strictly speaking wrong
since NULL may actually have been mapped in user-space :)

Cheers,
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Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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