From: Oliver Neukum oneukum@suse.com
commit 397430b50a363d8b7bdda00522123f82df6adc5e upstream.
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/usb/usbnet.c | 4 ++++ 1 file changed, 4 insertions(+)
--- a/drivers/net/usb/usbnet.c +++ b/drivers/net/usb/usbnet.c @@ -1740,6 +1740,10 @@ usbnet_probe (struct usb_interface *udev 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))