[PATCH] usbnet: sanity check for maxpacket

[Oliver Neukum]

We cannot leave maxpacket at 0 because we divide by it.
Devices that give us a 0 there are unlikely to work, but let's
assume a 1, so we don't oops and a least try to operate.

Signed-off-by: Oliver Neukum <oneukum@xxxxxxxx>
Reported-by: syzbot+76bb1d34ffa0adc03baa@xxxxxxxxxxxxxxxxxxxxxxxxx
---
 drivers/net/usb/usbnet.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c
index 840c1c2ab16a..2bdc3e0c1579 100644
--- a/drivers/net/usb/usbnet.c
+++ b/drivers/net/usb/usbnet.c
@@ -1788,6 +1788,9 @@ 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 strange device */
+		dev->maxpacket = 1;
 
 	/* let userspace know we have a random address */
 	if (ether_addr_equal(net->dev_addr, node_id))
-- 
2.26.2


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