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: <20111104210447.GA3934@suse.de>
Date:	Fri, 4 Nov 2011 14:04:47 -0700
From:	Greg KH <gregkh@...e.de>
To:	Dan Carpenter <dan.carpenter@...cle.com>
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 Sat, Nov 05, 2011 at 12:00:55AM +0300, Dan Carpenter wrote:
> 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.

Ugh, you are right.

Xiaotian, please fix this correctly upstream, I'll go drop this patch
for now from the stable trees.

thanks,

greg k-h
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