This is a note to let you know that I've just added the patch titled
usbnet: sanity check for maxpacket
to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usbnet-sanity-check-for-maxpacket.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 397430b50a363d8b7bdda00522123f82df6adc5e Mon Sep 17 00:00:00 2001
From: Oliver Neukum <oneukum@xxxxxxxx>
Date: Thu, 21 Oct 2021 14:29:44 +0200
Subject: usbnet: sanity check for maxpacket
From: Oliver Neukum <oneukum@xxxxxxxx>
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@xxxxxxxx>
Reported-by: syzbot+76bb1d34ffa0adc03baa@xxxxxxxxxxxxxxxxxxxxxxxxx
Reviewed-by: Johan Hovold <johan@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20211021122944.21816-1-oneukum@xxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/usb/usbnet.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/drivers/net/usb/usbnet.c
+++ b/drivers/net/usb/usbnet.c
@@ -1788,6 +1788,10 @@ 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))
Patches currently in stable-queue which might be from oneukum@xxxxxxxx are
queue-4.14/usbnet-sanity-check-for-maxpacket.patch
