linux-kernel - Re: [PATCH] vfs: fix vmplice_to

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Message-ID: <20140527175755.GV18016@ZenIV.linux.org.uk>
Date:	Tue, 27 May 2014 18:57:55 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Miklos Szeredi <miklos@...redi.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH] vfs: fix vmplice_to_user()

On Tue, May 27, 2014 at 10:04:58AM -0700, Linus Torvalds wrote:
> On Tue, May 27, 2014 at 7:41 AM, Miklos Szeredi <miklos@...redi.hu> wrote:
> >
> > This patch fixes two bugs:
> 
> Mind if I change it to avoid the "goto"? I don't think goto is evil,
> but in this case it doesn't seem to buy anything, except to perhaps
> make the patch a bit smaller at the expense of making the result a bit
> harder to read.
> 
> Replacing the
> 
>    if (ret <= 0)
>       goto out;
> 
> with
> 
>    if (ret > 0) {
>        ...
>    }
> 
> also allows moving the various variable declarations closer to their use.
> 
> So something like the attached..

I'm not sure it's better; I've a pending patch that does combination of
rw_copy_check_uvector() with iov_iter_init(), which means that iov
array will be going to the outer scope anyway...
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