1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c
index 4b8b52ca09d8..febfdceeb9e5 100644
--- a/drivers/net/usb/usbnet.c
+++ b/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);