PERFORCE change 158986 for review

[Hans Petter Selasky]

http://perforce.freebsd.org/chv.cgi?CH=158986

Change 158986 by hselasky at hselasky_laptop001 on 2009/03/10 11:05:41

	
	USB CORE: Fix a possible NULL pointer access at controller attach.

Affected files ...

.. //depot/projects/usb/src/sys/dev/usb/controller/usb_controller.c#2 edit

Differences ...

==== //depot/projects/usb/src/sys/dev/usb/controller/usb_controller.c#2 (text+ko) ====

@@ -346,7 +346,8 @@
 		err = usb2_probe_and_attach(child,
 		    USB_IFACE_INDEX_ANY);
 		if (!err) {
-			if (!bus->devices[USB_ROOT_HUB_ADDR]->hub) {
+			if ((bus->devices[USB_ROOT_HUB_ADDR] == NULL) ||
+			    (bus->devices[USB_ROOT_HUB_ADDR]->hub == NULL)) {
 				err = USB_ERR_NO_ROOT_HUB;
 			}
 		}