linux-kernel - Re: [PATCH v9] nbd: fix uaf in nbd_handle

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Date:   Sun, 17 Oct 2021 07:09:16 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Yu Kuai <yukuai3@...wei.com>, ming.lei@...hat.com,
        josef@...icpanda.com
Cc:     Jens Axboe <axboe@...nel.dk>, nbd@...er.debian.org,
        yi.zhang@...wei.com, linux-kernel@...r.kernel.org,
        linux-block@...r.kernel.org
Subject: Re: [PATCH v9] nbd: fix uaf in nbd_handle_reply()

On Thu, 16 Sep 2021 22:18:10 +0800, Yu Kuai wrote:
> There is a problem that nbd_handle_reply() might access freed request:
> 
> 1) At first, a normal io is submitted and completed with scheduler:
> 
> internel_tag = blk_mq_get_tag -> get tag from sched_tags
>  blk_mq_rq_ctx_init
>   sched_tags->rq[internel_tag] = sched_tag->static_rq[internel_tag]
> ...
> blk_mq_get_driver_tag
>  __blk_mq_get_driver_tag -> get tag from tags
>  tags->rq[tag] = sched_tag->static_rq[internel_tag]
> 
> [...]

Applied, thanks!

[1/1] nbd: fix uaf in nbd_handle_reply()
      commit: 52c90e0184f67eecb00b53b79bfdf75e0274f8fd

Best regards,
-- 
Jens Axboe