[PATCH V4] usbnet: Prevents free active kevent

[Lizhi Xu <lizhi.xu@windriver.com>]

The root cause of this issue are:
1. When probing the usbnet device, executing usbnet_link_change(dev, 0, 0);
put the kevent work in global workqueue. However, the kevent has not yet
been scheduled when the usbnet device is unregistered. Therefore, executing
free_netdev() results in the "free active object (kevent)" error reported
here.

2. Another factor is that when calling usbnet_disconnect()->unregister_netdev(),
if the usbnet device is up, ndo_stop() is executed to cancel the kevent.
However, because the device is not up, ndo_stop() is not executed.

The solution to this problem is to cancel the kevent before executing
free_netdev().

Fixes: a69e617e533e ("usbnet: Fix linkwatch use-after-free on disconnect")
Reported-by: Sam Sun <samsun1006219@gmail.com>
Closes: https://syzkaller.appspot.com/bug?extid=8bfd7bcc98f7300afb84
Signed-off-by: Lizhi Xu <lizhi.xu@windriver.com>
---
V1 -> V2: update comments for typos
V2 -> V3: add fixes tag
V3 -> V4: move cancel_work_sync to right after unregister_netdev

 drivers/net/usb/usbnet.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c
index bf01f2728531..697cd9d866d3 100644
--- a/drivers/net/usb/usbnet.c
+++ b/drivers/net/usb/usbnet.c
@@ -1659,6 +1659,8 @@ void usbnet_disconnect (struct usb_interface *intf)
 	net = dev->net;
 	unregister_netdev (net);
 
+	cancel_work_sync(&dev->kevent);
+
 	while ((urb = usb_get_from_anchor(&dev->deferred))) {
 		dev_kfree_skb(urb->context);
 		kfree(urb->sg);
-- 
2.43.0