linux-kernel - Re: [PATCH v3] can, tty: elmcan CAN/ldisc driver for ELM327 based OBD-II adapters

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Date:   Mon, 14 Mar 2022 23:00:42 +0100
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Vincent Mailhol <vincent.mailhol@...il.com>
Cc:     Max Staudt <max@...as.org>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        linux-can@...r.kernel.org, Oliver Neukum <oneukum@...e.com>,
        linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>
Subject: Re: [PATCH v3] can, tty: elmcan CAN/ldisc driver for ELM327 based
 OBD-II adapters

On 08.03.2022 16:01:12, Vincent Mailhol wrote:
> > +/* Send a can_frame to a TTY. */
> > +static netdev_tx_t elmcan_netdev_start_xmit(struct sk_buff *skb,
> > +                                           struct net_device *dev)
> > +{
> > +       struct elmcan *elm = netdev_priv(dev);
> > +       struct can_frame *frame = (struct can_frame *)skb->data;
> > +
> > +       if (skb->len != sizeof(struct can_frame))
> > +               goto out;
> 
> Isn’t this aleardy guaranteed by the upper layers?

You can always inject packets via the packet socket into the kernel,
bypassing e.g. the CAN RAW layer.

regards,
Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
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