linux-kernel - Re: [patch -resend] NVMe: check for integer overflow in nvme_map_user

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Date:	Fri, 17 May 2013 09:41:28 -0400
From:	Matthew Wilcox <willy@...ux.intel.com>
To:	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	Matthew Wilcox <matthew.r.wilcox@...el.com>,
	Keith Busch <keith.busch@...el.com>,
	Vishal Verma <vishal.l.verma@...el.com>,
	kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-nvme@...ts.infradead.org
Subject: Re: [patch -resend] NVMe: check for integer overflow in
 nvme_map_user_pages()

On Mon, May 13, 2013 at 05:59:50PM +0300, Dan Carpenter wrote:
> You need to have CAP_SYS_ADMIN to trigger this overflow but it makes the
> static checkers complain so we should fix it.  The worry is that
> "length" comes from copy_from_user() so we need to check that "length +
> offset" can't overflow.
> 
> I also changed the min_t() cast to be unsigned instead of signed.  Now
> that we cap "length" to INT_MAX it doesn't make a difference, but it's a
> little easier for reviewers to know that large values aren't cast to
> negative.
> 
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

Applied
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