---

yaml
---
r: 294679
b: refs/heads/master
c: 0956a8c
h: refs/heads/master
i:
  294677: 6b8d50a
  294675: 5248320
  294671: e461cae
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 1265fd616782ef03b98fd19f65c2b47fcd4ea11f
+refs/heads/master: 0956a8c20b23d429e79ff86d4325583fc06f9eb4

trunk/drivers/net/usb/usbnet.c

@@ -589,6 +589,14 @@ static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q)
 		entry = (struct skb_data *) skb->cb;
 		urb = entry->urb;
 
+		/*
+		 * Get reference count of the URB to avoid it to be
+		 * freed during usb_unlink_urb, which may trigger
+		 * use-after-free problem inside usb_unlink_urb since
+		 * usb_unlink_urb is always racing with .complete
+		 * handler(include defer_bh).
+		 */
+		usb_get_urb(urb);
 		spin_unlock_irqrestore(&q->lock, flags);
 		// during some PM-driven resume scenarios,
 		// these (async) unlinks complete immediately
@@ -597,6 +605,7 @@ static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q)
 			netdev_dbg(dev->net, "unlink urb err, %d\n", retval);
 		else
 			count++;
+		usb_put_urb(urb);
 		spin_lock_irqsave(&q->lock, flags);
 	}
 	spin_unlock_irqrestore (&q->lock, flags);