linux-kernel - Re: [PATCH] nbd: defer config put in recv

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Message-Id: <176260921037.52069.3327906711798432611.b4-ty@kernel.dk>
Date: Sat, 08 Nov 2025 06:40:10 -0700
From: Jens Axboe <axboe@...nel.dk>
To: josef@...icpanda.com, xiubli@...hat.com, 
 Zheng Qixing <zhengqixing@...weicloud.com>
Cc: linux-block@...r.kernel.org, nbd@...er.debian.org, 
 linux-kernel@...r.kernel.org, yi.zhang@...wei.com, yangerkun@...wei.com, 
 houtao1@...wei.com, linan122@...artners.com, zhengqixing@...wei.com
Subject: Re: [PATCH] nbd: defer config put in recv_work


On Sat, 08 Nov 2025 15:02:02 +0800, Zheng Qixing wrote:
> There is one uaf issue in recv_work when running NBD_CLEAR_SOCK and
> NBD_CMD_RECONFIGURE:
>   nbd_genl_connect     // conf_ref=2 (connect and recv_work A)
>   nbd_open	       // conf_ref=3
>   recv_work A done     // conf_ref=2
>   NBD_CLEAR_SOCK       // conf_ref=1
>   nbd_genl_reconfigure // conf_ref=2 (trigger recv_work B)
>   close nbd	       // conf_ref=1
>   recv_work B
>     config_put         // conf_ref=0
>     atomic_dec(&config->recv_threads); -> UAF
> 
> [...]

Applied, thanks!

[1/1] nbd: defer config put in recv_work
      commit: 9517b82d8d422d426a988b213fdd45c6b417b86d

Best regards,
-- 
Jens Axboe