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usbnet: sanity check for maxpacket 

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

Signed-off-by: Oliver Neukum <oneukum@suse.com>
Reported-by: syzbot+76bb1d34ffa0adc03baa@syzkaller.appspotmail.com
Reviewed-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20211021122944.21816-1-oneukum@suse.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Oliver Neukum 2021-10-21 14:29:44 +02:00 committed by Jakub Kicinski
parent e378f4967c
commit 397430b50a
1 changed files with 4 additions and 0 deletions
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4
drivers/net/usb/usbnet.c
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@ -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))