linux-ext4 - Re: [PATCH 1/2] ext4: Fix crash in ext4_bdev_mark

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Message-ID: <ZJMOqynQKadyBOXX@infradead.org>
Date:   Wed, 21 Jun 2023 07:52:27 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Jan Kara <jack@...e.cz>
Cc:     Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org,
        Christoph Hellwig <hch@...radead.org>,
        linux-ext4@...r.kernel.org, linux-xfs@...r.kernel.org
Subject: Re: [PATCH 1/2] ext4: Fix crash in ext4_bdev_mark_dead()

On Wed, Jun 21, 2023 at 04:47:42PM +0200, Jan Kara wrote:
> ext4_bdev_mark_dead() passes bdev->bd_holder to ext4_force_shutdown()
> instead of bdev->bd_super leading to crashes. Fix it.

How does this crash? ext4_blkdev_get passes the sb as holder, and I
actually tested this code.

This is not to be confused with the blkdev_get_by_path in get_tree_bdev,
but that never ends up in ext4_bdev_mark_dead.