linux-kernel - Re: [PATCH] NFS: nfsaclsvc_encode_getaclres() - Fix potential NULL deref and tiny optimization.

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Date:	Tue, 31 Oct 2006 17:40:21 +0100
From:	"Jesper Juhl" <jesper.juhl@...il.com>
To:	"Andreas Gruenbacher" <agruen@...e.de>
Cc:	"David Rientjes" <rientjes@...washington.edu>,
	linux-kernel@...r.kernel.org, "Neil Brown" <neilb@....unsw.edu.au>,
	nfs@...ts.sourceforge.net, "Andrew Morton" <akpm@...l.org>
Subject: Re: [PATCH] NFS: nfsaclsvc_encode_getaclres() - Fix potential NULL deref and tiny optimization.

On 31/10/06, Andreas Gruenbacher <agruen@...e.de> wrote:
> On Saturday 28 October 2006 00:01, Jesper Juhl wrote:
> > > > 3) There are two locations in the function where we may return before
> > > > we use the value of the variable 'w', but we compute it at the very top
> > > > of the function. So in the case where we return early we have wasted a
> > > > few cycles computing a value that was never used.
>
> Computing w later in the function is fine.
>
> > > w should be an unsigned int.
> >
> > Makes sense.
>
> No, this breaks the while loop further below: with an unsigned int, the loop
> counter underflows and wraps.
>
Whoops. OK.

> Please fix this identically in fs/nfsd/nfs2acl.c and fs/nfsd/nfs3acl.c.
>
Sure thing, expect patches later this evening.

BTW: I posted an add-on patch on top of my first one - apart from the
"make w unsigned" bit, is the rest of that OK?

-- 
Jesper Juhl <jesper.juhl@...il.com>
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