V4L/DVB (8257): uvcvideo: Fix possible AB-BA deadlock with videodev_lock and open_mutex

The uvcvideo driver's uvc_v4l2_open() method is called from videodev's
video_open() function, which means it is called with the videodev_lock
mutex held.  uvc_v4l2_open() then takes uvc_driver.open_mutex to check
dev->state and avoid racing against a device disconnect, which means
that open_mutex must nest inside videodev_lock.

However uvc_disconnect() takes the open_mutex around setting
dev->state and also around putting its device reference.  However, if
uvc_disconnect() ends up dropping the last reference, it will call
uvc_delete(), which calls into the videodev code to unregister its
device, and this will end up taking videodev_lock.  This opens a
(unlikely in practice) window for an AB-BA deadlock and also causes a
lockdep warning because of the lock misordering.

Fortunately there is no apparent reason to hold open_mutex when doing
kref_put() in uvc_disconnect(): if uvc_v4l2_open() runs before the
state is set to UVC_DEV_DISCONNECTED, then it will take another
reference to the device and kref_put() won't call uvc_delete; if
uvc_v4l2_open() runs after the state is set, it will run before
uvc_delete(), see the state, and return immediately -- uvc_delete()
does uvc_unregister_video() (and hence video_unregister_device(),
which is synchronized with videodev_lock) as its first thing, so there
is no risk of use-after-free in uvc_v4l2_open().

Bug diagnosed based on a lockdep warning reported by Romano Giannetti
<romano@dea.icai.upcomillas.es>.
Signed-off-by: NRoland Dreier <roland@digitalvampire.org>
Signed-off-by: NLaurent Pinchart <laurent.pinchart@skynet.be>
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/uvc/uvc_driver.c

@@ -1633,13 +1633,16 @@ static void uvc_disconnect(struct usb_interface *intf)
 	 * reference to the uvc_device instance after uvc_v4l2_open() received
 	 * the pointer to the device (video_devdata) but before it got the
 	 * chance to increase the reference count (kref_get).
+	 *
+	 * Note that the reference can't be released with the lock held,
+	 * otherwise a AB-BA deadlock can occur with videodev_lock that
+	 * videodev acquires in videodev_open() and video_unregister_device().
 	 */
 	mutex_lock(&uvc_driver.open_mutex);
-
 	dev->state |= UVC_DEV_DISCONNECTED;
-	kref_put(&dev->kref, uvc_delete);
-
 	mutex_unlock(&uvc_driver.open_mutex);
+
+	kref_put(&dev->kref, uvc_delete);
 }
 
 static int uvc_suspend(struct usb_interface *intf, pm_message_t message)