usb: hub: take hub->hdev reference when processing from eventlist

During surprise device hotplug removal tests, it was observed that
hub_events may try to call usb_lock_device on a device that has already
been freed. Protect the usb_device by taking out a reference (under the
hub_event_lock) when hub_events pulls it off the list, returning the
reference after hub_events is finished using it.

Signed-off-by: Joe Lawrence <joe.lawrence@stratus.com>
Suggested-by: David Bulkow <david.bulkow@stratus.com> for using kref
Suggested-by: Alan Stern <stern@rowland.harvard.edu> for placement
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 46f5161c78913c75678ae3416f4031099b880090..d481c99a20d7b13adc9b9ec5c00565fd7d0ecc60 100644 (file)
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -5024,9 +5024,10 @@ static void hub_events(void)
 
                hub = list_entry(tmp, struct usb_hub, event_list);
                kref_get(&hub->kref);
+               hdev = hub->hdev;
+               usb_get_dev(hdev);
                spin_unlock_irq(&hub_event_lock);
 
-               hdev = hub->hdev;
                hub_dev = hub->intfdev;
                intf = to_usb_interface(hub_dev);
                dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n",
@@ -5139,6 +5140,7 @@ static void hub_events(void)
                usb_autopm_put_interface(intf);
  loop_disconnected:
                usb_unlock_device(hdev);
+               usb_put_dev(hdev);
                kref_put(&hub->kref, hub_release);
 
        } /* end while (1) */