netdev - Re: [PATCH v3 12/18] crypto: switch af_alg_make_sg() to iov

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Date:	Mon, 9 Feb 2015 17:28:11 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Stephan Mueller <smueller@...onox.de>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	linux-crypto@...r.kernel.org
Subject: Re: [PATCH v3 12/18] crypto: switch af_alg_make_sg() to iov_iter

On Mon, Feb 09, 2015 at 02:33:48PM +0100, Stephan Mueller wrote:
> > 
> > -int af_alg_make_sg(struct af_alg_sgl *sgl, void __user *addr, int len,
> > -		   int write)
> > +int af_alg_make_sg(struct af_alg_sgl *sgl, struct iov_iter *iter, int len)
> 
> Shouldn't len be size_t? iov_iter_get_pages wants a size_t. Also, the 
> invocation of af_alg_make_sg uses an unsigned variable that is provided by 
> userspace.

Keepo in mind that rw_copy_check_uvector() does, among other things,
verify that total length is less than 2^31.  So this code doesn't
suffer from wraparounds; it might make sense to switch to size_t here,
but that's a separate patch, IMO.  For this conversion I just kept
the type that used to be there.
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