linux-kernel - Re: [PATCH 0/2] can: j1939: avoid possible use-after-free when j1939_can_rx

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Date:   Mon, 5 Jun 2023 08:37:16 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Fedor Pchelkin <pchelkin@...ras.ru>
Cc:     Oleksij Rempel <linux@...pel-privat.de>, kernel@...gutronix.de,
        Robin van der Gracht <robin@...tonic.nl>,
        Oliver Hartkopp <socketcan@...tkopp.net>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Kurt Van Dijck <dev.kurt@...dijck-laurijssen.be>,
        linux-can@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Alexey Khoroshilov <khoroshilov@...ras.ru>,
        lvc-project@...uxtesting.org
Subject: Re: [PATCH 0/2] can: j1939: avoid possible use-after-free when
 j1939_can_rx_register fails

On 26.05.2023 20:19:08, Fedor Pchelkin wrote:
> The patch series fixes a possible racy use-after-free scenario described
> in 2/2: if j1939_can_rx_register() fails then the concurrent thread may
> have already read the invalid priv structure.
>
> The 1/2 makes j1939_netdev_lock a mutex so that access to
> j1939_can_rx_register() can be serialized without changing GFP_KERNEL to
> GFP_ATOMIC inside can_rx_register(). This seems to be safe.
>
> Note that the patch series has been tested only via Syzkaller and not with
> a real device.

Applied to linux-can + adding stable on Cc.

Thanks,
Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde          |
Embedded Linux                   | https://www.pengutronix.de |
Vertretung Nürnberg              | Phone: +49-5121-206917-129 |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-9   |

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