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Date:   Sun, 17 Oct 2021 12:43:29 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Ziyang Xuan <william.xuanziyang@...wei.com>
Cc:     robin@...tonic.nl, linux@...pel-privat.de, socketcan@...tkopp.net,
        davem@...emloft.net, kuba@...nel.org, linux-can@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] can: j1939: fix UAF for rx_kref of j1939_priv

On 26.09.2021 18:47:57, Ziyang Xuan wrote:
> It will trigger UAF for rx_kref of j1939_priv as following.
> 
>         cpu0                                    cpu1
> j1939_sk_bind(socket0, ndev0, ...)
> j1939_netdev_start
>                                         j1939_sk_bind(socket1, ndev0, ...)
>                                         j1939_netdev_start
> j1939_priv_set
>                                         j1939_priv_get_by_ndev_locked
> j1939_jsk_add
> .....
> j1939_netdev_stop
> kref_put_lock(&priv->rx_kref, ...)
>                                         kref_get(&priv->rx_kref, ...)
>                                         REFCOUNT_WARN("addition on 0;...")
> 
> ====================================================
> refcount_t: addition on 0; use-after-free.
> WARNING: CPU: 1 PID: 20874 at lib/refcount.c:25 refcount_warn_saturate+0x169/0x1e0
> RIP: 0010:refcount_warn_saturate+0x169/0x1e0
> Call Trace:
>  j1939_netdev_start+0x68b/0x920
>  j1939_sk_bind+0x426/0xeb0
>  ? security_socket_bind+0x83/0xb0
> 
> The rx_kref's kref_get() and kref_put() should use j1939_netdev_lock to
> protect.
> 
> Fixes: 9d71dd0c70099 ("can: add support of SAE J1939 protocol")
> Reported-by: syzbot+85d9878b19c94f9019ad@...kaller.appspotmail.com
> Signed-off-by: Ziyang Xuan <william.xuanziyang@...wei.com>

Added to linux-can/testing, added stable on Cc.

Thanks,
Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
Vertretung West/Dortmund         | Phone: +49-231-2826-924     |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-5555 |

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