netdev - Re: [PATCH v4 1/3] can: dev: can_restart: fix use after free bug

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Date:   Wed, 20 Jan 2021 13:53:05 +0100
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Vincent Mailhol <mailhol.vincent@...adoo.fr>,
        Oliver Hartkopp <socketcan@...tkopp.net>,
        linux-can@...r.kernel.org
Cc:     netdev@...r.kernel.org, Wolfgang Grandegger <wg@...ndegger.com>,
        Stephane Grosjean <s.grosjean@...k-system.com>,
        Loris Fauster <loris.fauster@...ontrol.com>,
        Alejandro Concepcion Rodriguez <alejandro@...ro.eu>,
        Dan Carpenter <dan.carpenter@...cle.com>
Subject: Re: [PATCH v4 1/3] can: dev: can_restart: fix use after free bug

On 1/20/21 12:41 PM, Vincent Mailhol wrote:
> After calling netif_rx_ni(skb), dereferencing skb is unsafe.
> Especially, the can_frame cf which aliases skb memory is accessed
> after the netif_rx_ni() in:
>       stats->rx_bytes += cf->len;
> 
> Reordering the lines solves the issue.
> 
> Fixes: 39549eef3587 ("can: CAN Network device driver and Netlink interface")
> Signed-off-by: Vincent Mailhol <mailhol.vincent@...adoo.fr>
> ---
> *Remark for upstream*
> drivers/net/can/dev.c has been moved to drivers/net/can/dev/dev.c in
> below commit, please carry the patch forward.
> Reference: 3e77f70e7345 ("can: dev: move driver related infrastructure
> into separate subdir")

I've send a pull request to Jakub and David. Let's see what happens :)

Marc

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



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