On Thu, Oct 21, 2021 at 02:29:44PM +0200, Oliver Neukum wrote:
> maxpacket of 0 makes no sense and oopses as we need to divide
> by it. Give up.
>
> V2: fixed typo in log and stylistic issues
Changelog goes below the ---
> Signed-off-by: Oliver Neukum <oneukum@xxxxxxxx>
> Reported-by: syzbot+76bb1d34ffa0adc03baa@xxxxxxxxxxxxxxxxxxxxxxxxx
Again,
Reviewed-by: Johan Hovold <johan@xxxxxxxxxx>
> ---
> drivers/net/usb/usbnet.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c
> index 840c1c2ab16a..80432ee0ce69 100644
> --- a/drivers/net/usb/usbnet.c
> +++ b/drivers/net/usb/usbnet.c
> @@ -1788,6 +1788,10 @@ usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
> if (!dev->rx_urb_size)
> dev->rx_urb_size = dev->hard_mtu;
> dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1);
> + if (dev->maxpacket == 0) {
> + /* that is a broken device */
> + goto out4;
> + }
>
> /* let userspace know we have a random address */
> if (ether_addr_equal(net->dev_addr, node_id))
