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

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Date:	Sat, 26 Nov 2011 18:52:52 -0800
From:	Greg KH <greg@...ah.com>
To:	Xi Wang <xi.wang@...il.com>
Cc:	Dan Carpenter <dan.carpenter@...cle.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 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?

confused,

greg k-h
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