linux-kernel - Re: [PATCH 4.19 130/276] block: fix use-after-free on gendisk

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Message-ID: <20190601072756.GA2215@amd>
Date:   Sat, 1 Jun 2019 09:27:56 +0200
From:   Pavel Machek <pavel@....cz>
To:     pavel@....cz
Cc:     linux-kernel@...r.kernel.org, Al Viro <viro@...iv.linux.org.uk>,
        Bart Van Assche <bvanassche@....org>,
        Keith Busch <keith.busch@...el.com>, Jan Kara <jack@...e.cz>,
        Yufen Yu <yuyufen@...wei.com>, Jens Axboe <axboe@...nel.dk>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 4.19 130/276] block: fix use-after-free on gendisk

Hi!

> +++ b/block/genhd.c
> @@ -518,6 +518,18 @@ void blk_free_devt(dev_t devt)
>  	}
>  }
>  
> +/**
> + *	We invalidate devt by assigning NULL pointer for devt in idr.
> + */
> +void blk_invalidate_devt(dev_t devt)
> +{
> +	if (MAJOR(devt) == BLOCK_EXT_MAJOR) {
> +		spin_lock_bh(&ext_devt_lock);
> +		idr_replace(&ext_devt_idr, NULL, blk_mangle_minor(MINOR(devt)));
> +		spin_unlock_bh(&ext_devt_lock);
> +	}
> +}
> +

AFAICT /** means linuxdoc, but the comment does not have required
format. Probably should be just /*.

Thanks,
								Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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