linux-kernel - Re: [PATCH v3] comedi: integer overflow in do_insnlist

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Date:	Mon, 28 Nov 2011 06:24:35 +0900
From:	Greg KH <greg@...ah.com>
To:	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	Xi Wang <xi.wang@...il.com>,
	"devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
	Mori Hess <fmhess@...rs.sourceforge.net>,
	"security@...nel.org" <security@...nel.org>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Ian Abbott <ian.abbott@....co.uk>,
	Lucas De Marchi <lucas.demarchi@...fusion.mobi>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ian Abbott <abbotti@....co.uk>,
	Franky Lin <frankyl@...adcom.com>,
	Greg Dietsche <gregory.dietsche@....edu>,
	Mark Pearson <markpearson_de@...oo.de>
Subject: Re: [PATCH v3] comedi: integer overflow in do_insnlist_ioctl()

On Sun, Nov 27, 2011 at 02:25:39PM +0300, Dan Carpenter wrote:
> On Sat, Nov 26, 2011 at 06:52:52PM -0800, Greg KH wrote:
> > On Fri, Nov 25, 2011 at 04:46:51PM -0500, Xi Wang wrote:
> > > There is a potential integer overflow in do_insnlist_ioctl() if
> > > userspace passes in a large insnlist.n_insns.  The call to kmalloc()
> > > would allocate a small buffer, leading to a memory corruption.
> > > 
> > > The bug was reported by Dan Carpenter <dan.carpenter@...cle.com>
> > > and Haogang Chen <haogangchen@...il.com>.  The patch was suggested by
> > > Ian Abbott <abbotti@....co.uk> and Lars-Peter Clausen <lars@...afoo.de>.
> > > 
> > > Signed-off-by: Xi Wang <xi.wang@...il.com>
> > 
> > Hm, I already applied Dan's previous patch, what should I do with this
> > one now?  Revert Dan's and apply this one, or apply both of them, or
> > something else?
> 
> Sorry for that, I should have replied to my patch when I learned that
> it had a problem.
> 
> Please, revert mine and apply Xi Wang's.

Ok, now done.

greg k-h
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