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

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Date:   Wed, 21 Jun 2023 07:53:25 -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 2/2] xfs: Fix crash in ext4_bdev_mark_dead()

On Wed, Jun 21, 2023 at 04:47:43PM +0200, Jan Kara wrote:
> xfs_bdev_mark_dead() passes bdev->bd_holder to ext4_force_shutdown()
> instead of bdev->bd_super leading to crashes. Fix it.

xfs_bdev_mark_dead is only called for the log and RT devices, for which
the mp is passed as holder to blkdev_get_by_path.  bd_super won't be
set for those devices, so this patch will introduce a crash and not fix
one.