linux-kernel - Re: [PATCH v2] media: rc: ir-lirc-codec: fix integer overflow

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Message-ID: <20101208161556.GB6586@redhat.com>
Date:	Wed, 8 Dec 2010 11:15:56 -0500
From:	Jarod Wilson <jarod@...hat.com>
To:	Vasiliy Kulikov <segoon@...nwall.com>
Cc:	Dan Carpenter <error27@...il.com>, kernel-janitors@...r.kernel.org,
	Mauro Carvalho Chehab <mchehab@...radead.org>,
	David Härdeman <david@...deman.nu>,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] media: rc: ir-lirc-codec: fix integer overflow

On Sun, Dec 05, 2010 at 12:05:22AM +0300, Vasiliy Kulikov wrote:
> 'n' may be bigger than MAX_INT*sizeof(int), if so checking of truncated
> (int)(n/sizeof(int)) for LIRCBUF_SIZE overflows and then using nontruncated 'count'
> doesn't make sense.  This is not a security issue as too big 'n' is catched in
> kmalloc() in memdup_user() call.  However, it's better to prevent WARN() in kmalloc().
> 
> Signed-off-by: Vasiliy Kulikov <segoon@...nwall.com>

Now that I have my head out of my arse wrt the actual issue here, the
redundancy issue from v1 is resolved, and I've managed a full night's
sleep... ;)

Acked-by: Jarod Wilson <jarod@...hat.com>

-- 
Jarod Wilson
jarod@...hat.com

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