linux-kernel - Re: [050/107] block: check for proper length of iov entries earlier in blk_rq_map_user

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Message-ID: <20111104210055.GK4751@mwanda>
Date:	Sat, 5 Nov 2011 00:00:55 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Greg KH <gregkh@...e.de>
Cc:	Ben Hutchings <ben@...adent.org.uk>,
	Xiaotian Feng <dfeng@...hat.com>,
	Jens Axboe <jaxboe@...ionio.com>, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk
Subject: Re: [050/107] block: check for proper length of iov entries earlier
 in blk_rq_map_user_iov()

On Fri, Nov 04, 2011 at 01:28:06PM -0700, Greg KH wrote:
> Doesn't this still fix one issue here, just not both of them described,
> right?

Not really.

We've got a list from 0 - 100.  We should be checking them all.
If number 50 is unaligned in the old version we would check 0 - 50,
but with this patch applied we check from 0 to 51.

regards,
dan carpenter

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