linux-kernel - Re: [PATCH] video: arcfb: fix buffer overflow

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Date:	Wed, 24 Nov 2010 15:59:21 +0900
From:	Paul Mundt <lethal@...ux-sh.org>
To:	Dan Carpenter <error27@...il.com>,
	Vasiliy Kulikov <segoon@...nwall.com>,
	kernel-janitors@...r.kernel.org, Jaya Kumar <jayalk@...works.biz>,
	linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] video: arcfb: fix buffer overflow

On Wed, Nov 24, 2010 at 09:46:49AM +0300, Dan Carpenter wrote:
> On Wed, Nov 24, 2010 at 03:25:58PM +0900, Paul Mundt wrote:
> > On Sun, Nov 21, 2010 at 08:40:01PM +0300, Vasiliy Kulikov wrote:
> > > (count + p) is not checked for integer overflow.  If p < fbmemlength
> > > and count == (size_t)(1 - p) (very big unsigned integer) then
> > > count + p == 1 < fbmemlength and copy_to_user(base_addr+p, buf, count)
> > > overflows base_addr.
> > > 
> > > Signed-off-by: Vasiliy Kulikov <segoon@...nwall.com>
> > 
> > Applied, thanks.
> 
> The patch is harmless, but the integer overflow would actually be caught
> in rw_verify_area().
> 
Ah, so it is, I'll drop it then, thanks.
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