linux-kernel - Re: [PATCH v11 4/6] xen/blkback: Protect 'reclaim_memory()' with 'reclaim

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Date:   Tue, 17 Dec 2019 17:15:12 +0100
From:   Jürgen Groß <jgross@...e.com>
To:     SeongJae Park <sjpark@...zon.com>, axboe@...nel.dk,
        konrad.wilk@...cle.com, roger.pau@...rix.com
Cc:     SeongJae Park <sjpark@...zon.de>, pdurrant@...zon.com,
        sj38.park@...il.com, xen-devel@...ts.xenproject.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v11 4/6] xen/blkback: Protect 'reclaim_memory()' with
 'reclaim_lock'

On 17.12.19 17:07, SeongJae Park wrote:
> From: SeongJae Park <sjpark@...zon.de>
> 
> The 'reclaim_memory()' callback of blkback could race with
> 'xen_blkbk_probe()' and 'xen_blkbk_remove()'.  In the case, incompletely
> linked 'backend_info' and 'blkif' might be exposed to the callback, thus
> result in bad results including NULL dereference.  This commit fixes the
> problem by applying the 'reclaim_lock' protection to those.
> 
> Note that this commit is separated for review purpose only.  As the
> previous commit might result in race condition and might make bisect
> confuse, please squash this commit into previous commit if possible.
> 
> Signed-off-by: SeongJae Park <sjpark@...zon.de>

Please merge this patch into patch 2.


Juergen