linux-ext4 - Re: possible unintended integer truncation in fs/ext4/extents.c:get_implied_cluster

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Message-ID: <20131220051256.GD23508@thunk.org>
Date:	Fri, 20 Dec 2013 00:12:56 -0500
From:	Theodore Ts'o <tytso@....edu>
To:	PaX Team <pageexec@...email.hu>
Cc:	linux-ext4@...r.kernel.org, re.emese@...il.com
Subject: Re: possible unintended integer truncation in
 fs/ext4/extents.c:get_implied_cluster_alloc

On Thu, Dec 19, 2013 at 11:59:20PM -0500, Theodore Ts'o wrote:
> So C's integer promotion and sign extension rules are very obscure and
> confusing, and that may be a reason why we should put in an explicit
> cast, but it looks like the right thing is happening here.  Here's a
> test program --- what am I missing?

Never mind, I see the problem.  It works if cr is a short, but not if
it is an unsigned int.  Sigh...

 					- Ted
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