linux-kernel - Re: [PATCH V2 1/4] zram: fix race between zram_reset_device() and disksize

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Message-ID: <YXHxrnnZpqCzOVDI@bombadil.infradead.org>
Date:   Thu, 21 Oct 2021 16:03:10 -0700
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     Ming Lei <ming.lei@...hat.com>
Cc:     Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org,
        Minchan Kim <minchan@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2 1/4] zram: fix race between zram_reset_device() and
 disksize_store()

On Wed, Oct 20, 2021 at 09:55:45AM +0800, Ming Lei wrote:
> When the ->init_lock is released in zram_reset_device(), disksize_store()
> can come in and try to allocate meta, but zram_reset_device() is freeing
> free meta, so cause races.
> 
> Link: https://lore.kernel.org/linux-block/20210927163805.808907-1-mcgrof@kernel.org/T/#mc617f865a3fa2778e40f317ddf48f6447c20c073
> Reported-by: Luis Chamberlain <mcgrof@...nel.org>
> Signed-off-by: Ming Lei <ming.lei@...hat.com>

Reviewed-by: Luis Chamberlain <mcgrof@...nel.org>

  Luis