netdev - Re: ipv4: Use standard iovec primitive in raw_probe_proto

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Date:	Thu, 6 Nov 2014 06:43:18 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, bcrl@...ck.org,
	Masahide Nakamura <nakam@...ux-ipv6.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>
Subject: Re: ipv4: Use standard iovec primitive in raw_probe_proto_opt

On Thu, Nov 06, 2014 at 01:50:23PM +0800, Herbert Xu wrote:
> +	/* We only need the first two bytes. */
> +	err = memcpy_fromiovecend((void *)&icmph, msg->msg_iov, 0, 2);
> +	if (err)
> +		return err;
> +
> +	fl4->fl4_icmp_type = icmph.type;
> +	fl4->fl4_icmp_code = icmph.code;

That's more readable, but that exposes another problem in there - we read
the same piece of userland data twice, with no promise whatsoever that we'll
get the same value both times...
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