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

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Message-Id: <169937013187.545643.6485076095455389311.b4-ty@kernel.dk>
Date:   Tue, 07 Nov 2023 08:15:31 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     josef@...icpanda.com, Li Lingfeng <lilingfeng@...weicloud.com>
Cc:     linux-kernel@...r.kernel.org, hch@....de,
        linux-block@...r.kernel.org, nbd@...er.debian.org,
        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


On Tue, 07 Nov 2023 18:34:35 +0800, Li Lingfeng wrote:
> Commit 4af5f2e03013 ("nbd: use blk_mq_alloc_disk and
> blk_cleanup_disk") cleans up disk by blk_cleanup_disk() and it won't set
> disk->private_data as NULL as before. UAF may be triggered in nbd_open()
> if someone tries to open nbd device right after nbd_put() since nbd has
> been free in nbd_dev_remove().
> 
> Fix this by implementing ->free_disk and free private data in it.
> 
> [...]

Applied, thanks!

[1/1] nbd: fix uaf in nbd_open
      commit: 327462725b0f759f093788dfbcb2f1fd132f956b

Best regards,
-- 
Jens Axboe