linux-kernel - Re: [PATCH v2] block: Fix use-after-free in blkdev

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Date:   Fri, 5 Jun 2020 10:30:35 +0200
From:   Markus Elfring <Markus.Elfring@....de>
To:     Jason Yan <yanaijie@...wei.com>, linux-block@...r.kernel.org,
        linux-fsdevel@...r.kernel.org
Cc:     hulkci@...wei.com, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org, Al Viro <viro@...iv.linux.org.uk>,
        Christoph Hellwig <hch@....de>, Jan Kara <jack@...e.cz>,
        Jens Axboe <axboe@...nel.dk>, Ming Lei <ming.lei@...hat.com>
Subject: Re: [PATCH v2] block: Fix use-after-free in blkdev_get()

> … released the refcount of the bdev (actually the refcount of
> the bdev inode).

Wording adjustments:
… released the reference count of the block device inode.


> … access bdev after …

… access block device after …


> accually bdev is …

bdev is …


> … This may leads to use-after-free if the refcount is …

… This results in an use after free if the reference count …


> following scenerio:

following scenario:


Would you like to add the tag “Fixes” to the commit message?

Regards,
Markus