usb: fail on usb_hub_create_port_device() errors

Ignoring usb_hub_create_port_device() errors cause later NULL pointer
deference when uninitialized hub->ports[i] entries are dereferenced
after port memory allocation error.
Signed-off-by: NKrzysztof Mazur <krzysiek@podlesie.net>
Acked-by: NAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/core/hub.c

@@ -1562,10 +1562,15 @@ static int hub_configure(struct usb_hub *hub,
 	if (hub->has_indicators && blinkenlights)
 		hub->indicator [0] = INDICATOR_CYCLE;
 
-	for (i = 0; i < hdev->maxchild; i++)
-		if (usb_hub_create_port_device(hub, i + 1) < 0)
+	for (i = 0; i < hdev->maxchild; i++) {
+		ret = usb_hub_create_port_device(hub, i + 1);
+		if (ret < 0) {
 			dev_err(hub->intfdev,
 				"couldn't create port%d device.\n", i + 1);
+			hdev->maxchild = i;
+			goto fail_keep_maxchild;
+		}
+	}
 
 	usb_hub_adjust_deviceremovable(hdev, hub->descriptor);
 
@@ -1574,6 +1579,7 @@ static int hub_configure(struct usb_hub *hub,
 
 fail:
 	hdev->maxchild = 0;
+fail_keep_maxchild:
 	dev_err (hub_dev, "config failed, %s (err %d)\n",
 			message, ret);
 	/* hub_disconnect() frees urb and descriptor */