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

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Message-ID: <20101202045126.GA1784@bicker>
Date:	Thu, 2 Dec 2010 07:51:26 +0300
From:	Dan Carpenter <error27@...il.com>
To:	Vasiliy Kulikov <segoon@...nwall.com>
Cc:	kernel-janitors@...r.kernel.org,
	Mauro Carvalho Chehab <mchehab@...radead.org>,
	David Härdeman <david@...deman.nu>,
	Jarod Wilson <jarod@...hat.com>, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: rc: ir-lirc-codec: fix potential integer
 overflow

On Fri, Nov 26, 2010 at 08:06:35PM +0300, Vasiliy Kulikov wrote:
>  	count = n / sizeof(int);
> -	if (count > LIRCBUF_SIZE || count % 2 == 0)
> +	if (count > LIRCBUF_SIZE || count % 2 == 0 || n % sizeof(int) != 0)
                                                      ^^^^^^^^^^^^^^^^^^^^

Wait, what?  We just checked this a couple lines before.

The rest of the patch is right and a clever catch.  It would affect 
x86_64 systems and not i386.  This doesn't have security implications
does it?  You'd just catch the kmalloc() stack trace for insanely large
allocations.

regards,
dan carpenter

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