linux-kernel - Re: [PATCH RESEND v2] dm: Fix use-after-free in dm_cleanup_zoned

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Date:   Wed, 23 Feb 2022 12:19:49 +0900
From:   Damien Le Moal <damien.lemoal@...nsource.wdc.com>
To:     Mike Snitzer <snitzer@...hat.com>
Cc:     Kirill Tkhai <ktkhai@...tuozzo.com>,
        "agk@...hat.com" <agk@...hat.com>,
        "dm-devel@...hat.com" <dm-devel@...hat.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RESEND v2] dm: Fix use-after-free in
 dm_cleanup_zoned_dev()

On 2/23/22 12:02, Mike Snitzer wrote:
> On Thu, Feb 17, 2022 at 5:49 AM Damien Le Moal
> <damien.lemoal@...nsource.wdc.com> wrote:
>>
>> On 2/17/22 19:13, Kirill Tkhai wrote:
>>>
>>> dm_cleanup_zoned_dev() uses queue, so it must be called
>>> before blk_cleanup_disk() starts its killing:
>>>
>>> blk_cleanup_disk->blk_cleanup_queue()->kobject_put()->blk_release_queue()->
>>> ->...RCU...->blk_free_queue_rcu()->kmem_cache_free()
>>>
>>> Otherwise, RCU callback may be executed first,
>>> and dm_cleanup_zoned_dev() touches freed memory:
>>
>> Mike,
>>
>> Can you queue this please ?
> 
> I queued it earlier today, please see:
> https://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm.git/commit/?h=dm-5.18&id=588b7f5df0cb64f281290c7672470c006abe7160
> 
> Thanks,
> Mike

Thanks !


-- 
Damien Le Moal
Western Digital Research