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

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Message-Id: <200610311726.00411.agruen@suse.de>
Date:	Tue, 31 Oct 2006 17:26:00 +0100
From:	Andreas Gruenbacher <agruen@...e.de>
To:	Jesper Juhl <jesper.juhl@...il.com>
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 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.

Please fix this identically in fs/nfsd/nfs2acl.c and fs/nfsd/nfs3acl.c.

Thanks,
Andreas
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