linux-kernel - Re: [PATCH 2/3] spufs: fix another off-by-one bug in mbox

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Message-ID: <84144f020610241142y2c86485dj898f555174803577@mail.gmail.com>
Date:	Tue, 24 Oct 2006 21:42:06 +0300
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Arnd Bergmann" <arnd@...db.de>
Cc:	"Paul Mackerras" <paulus@...ba.org>, linuxppc-dev@...abs.org,
	cbe-oss-dev@...abs.org, linux-kernel@...r.kernel.org,
	"Arnd Bergmann" <arnd.bergmann@...ibm.com>
Subject: Re: [PATCH 2/3] spufs: fix another off-by-one bug in mbox_read

Hi Arnd,

On 10/24/06, Arnd Bergmann <arnd@...db.de> wrote:
>         spu_acquire(ctx);
> -       for (count = 0; count <= len; count += 4, udata++) {
> +       for (count = 0; (count + 4) <= len; count += 4, udata++) {

Wouldn't this be more obvious as

  for (count = 0, count < (len / 4); count++, udata++) {

And then do count * 4 if you need the actual index somewhere. Hmm?
-
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