linux-kernel - Re: [PATCH] fix crash when using XFS on loopback

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Message-ID: <BLU0-SMTP390C5C965F9A4FB18F1EBE97B50@phx.gbl>
Date:	Sat, 4 Jan 2014 13:48:19 -0500
From:	John David Anglin <dave.anglin@...l.net>
To:	Mikulas Patocka <mpatocka@...hat.com>
CC:	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andi Kleen <ak@...ux.intel.com>,
	Christoph Lameter <cl@...ux.com>,
	Pekka Enberg <penberg@....fi>, linux-kernel@...r.kernel.org,
	linux-parisc@...r.kernel.org
Subject: Re: [PATCH] fix crash when using XFS on loopback

On 4-Jan-14, at 12:45 PM, Mikulas Patocka wrote:

> * flush_dcache_page asks for the list of userspace mappings, however  
> that
>  page->mapping field is reused by the slab subsystem for a different
>  purpose. This causes the crash.

I'd noticed the other day that the parisc implementation of  
flush_dcache_page()
should return if "!mapping || mapping != page->mapping" is true.  This  
would
have avoided crash.

Dave
--
John David Anglin	dave.anglin@...l.net



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