linux-kernel - Re: [PATCH v2] nbd: fix uaf in nbd

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Date:   Wed, 8 Nov 2023 08:19:25 +0100
From:   Christoph Hellwig <hch@....de>
To:     Li Lingfeng <lilingfeng@...weicloud.com>
Cc:     josef@...icpanda.com, linux-kernel@...r.kernel.org, hch@....de,
        linux-block@...r.kernel.org, nbd@...er.debian.org, axboe@...nel.dk,
        chaitanya.kulkarni@....com, yukuai1@...weicloud.com,
        houtao1@...wei.com, yi.zhang@...wei.com, yangerkun@...wei.com,
        lilingfeng3@...wei.com
Subject: Re: [PATCH v2] nbd: fix uaf in nbd_open

I don't think this is actually enough on it's own.  You'll also
need to move al the teardown logic that is currently in
nbd_dev_remove.  And with this you should be able to remove the
NULL check in nbd_open, and propably the nbd_index_mutex critical
section.  Although that'll need a very careful audit.