linux-kernel - Re: [PATCH] drivers/block/null_blk/main: Fix a double free in null

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Date:   Mon, 26 Apr 2021 09:05:04 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Lv Yunlong <lyl2019@...l.ustc.edu.cn>, damien.lemoal@....com,
        johannes.thumshirn@....com, martin.petersen@...cle.com
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drivers/block/null_blk/main: Fix a double free in
 null_init.

On 4/26/21 8:32 AM, Lv Yunlong wrote:
> In null_init, null_add_dev(dev) is called.
> In null_add_dev, it calls null_free_zoned_dev(dev) to free dev->zones
> via kvfree(dev->zones) in out_cleanup_zone branch and returns err.
> Then null_init accept the err code and then calls null_free_dev(dev).
> 
> But in null_free_dev(dev), dev->zones is freed again by
> null_free_zoned_dev().
> 
> My patch set dev->zones to NULL in null_free_zoned_dev() after
> kvfree(dev->zones) is called, to avoid the double free.

Applied, thanks.

-- 
Jens Axboe