diff --git a/sys/dev/usb/if_cdce.c b/sys/dev/usb/if_cdce.c
index 54a2c8ebe39f..d41a54f0cc0b 100644
--- a/sys/dev/usb/if_cdce.c
+++ b/sys/dev/usb/if_cdce.c
@@ -280,7 +280,8 @@ cdce_attach(device_t self)
 
 	ue = (const usb_cdc_ethernet_descriptor_t *)usb_find_desc(dev,
 	    UDESC_INTERFACE, UDESCSUB_CDC_ENF);
-	if (!ue || usbd_get_string(dev, ue->iMacAddress, eaddr_str)) {
+	if (!ue || usbd_get_string(dev, ue->iMacAddress, eaddr_str,
+	    sizeof(eaddr_str))) {
 		/* Fake MAC address */
 		device_printf(sc->cdce_dev, "faking MAC address\n");
 		eaddr[0]= 0x2a;
diff --git a/sys/dev/usb/uhub.c b/sys/dev/usb/uhub.c
index 26defca9e003..86fbba216e77 100644
--- a/sys/dev/usb/uhub.c
+++ b/sys/dev/usb/uhub.c
@@ -655,7 +655,8 @@ uhub_child_pnpinfo_str(device_t cbdev, device_t child, char *buf,
 
 found_dev:
 	/* XXX can sleep */
-	(void)usbd_get_string(dev, dev->ddesc.iSerialNumber, &serial[0]);
+	(void)usbd_get_string(dev, dev->ddesc.iSerialNumber, serial,
+	    sizeof(serial));
 	if (dev->ifacenums == NULL) {
 		snprintf(buf, buflen, "vendor=0x%04x product=0x%04x "
 		    "devclass=0x%02x devsubclass=0x%02x "
diff --git a/sys/dev/usb/usb_subr.c b/sys/dev/usb/usb_subr.c
index 4822aa02d8d0..575b111ff101 100644
--- a/sys/dev/usb/usb_subr.c
+++ b/sys/dev/usb/usb_subr.c
@@ -213,12 +213,14 @@ usbd_devinfo_vp(usbd_device_handle dev, char *v, char *p, int usedev)
 	}
 
 	if (usedev) {
-		if (usbd_get_string(dev, udd->iManufacturer, v))
+		if (usbd_get_string(dev, udd->iManufacturer, v,
+		    USB_MAX_STRING_LEN))
 			vendor = NULL;
 		else
 			vendor = v;
 		usbd_trim_spaces(vendor);
-		if (usbd_get_string(dev, udd->iProduct, p))
+		if (usbd_get_string(dev, udd->iProduct, p,
+		    USB_MAX_STRING_LEN))
 			product = NULL;
 		else
 			product = p;
@@ -1052,6 +1054,20 @@ usbd_new_device(device_t parent, usbd_bus_handle bus, int depth,
 
 	up->device = dev;
 
+	if (up->parent && speed > up->parent->speed) {
+#ifdef USB_DEBUG
+		printf("%s: maxium speed of attached "
+		    "device, %d, is higher than speed "
+		    "of parent HUB, %d.\n",
+		    __FUNCTION__, speed, up->parent->speed);
+#endif
+		/*
+		 * Reduce the speed, otherwise we won't setup the
+		 * proper transfer methods.
+		 */
+		speed = up->parent->speed;
+	}
+	
 	/* Locate port on upstream high speed hub */
 	for (adev = dev, hub = up->parent;
 	     hub != NULL && hub->speed != USB_SPEED_HIGH;
diff --git a/sys/dev/usb/usbdi.c b/sys/dev/usb/usbdi.c
index 480658dc14d7..35c201cca5ee 100644
--- a/sys/dev/usb/usbdi.c
+++ b/sys/dev/usb/usbdi.c
@@ -1310,7 +1310,7 @@ usb_desc_iter_next(usbd_desc_iter_t *iter)
 }
 
 usbd_status
-usbd_get_string(usbd_device_handle dev, int si, char *buf)
+usbd_get_string(usbd_device_handle dev, int si, char *buf, size_t len)
 {
 	int swap = dev->quirks->uq_flags & UQ_SWAP_UNICODE;
 	usb_string_descriptor_t us;
@@ -1321,6 +1321,8 @@ usbd_get_string(usbd_device_handle dev, int si, char *buf)
 	int size;
 
 	buf[0] = '\0';
+	if (len == 0)
+		return (USBD_NORMAL_COMPLETION);
 	if (si == 0)
 		return (USBD_INVAL);
 	if (dev->quirks->uq_flags & UQ_NO_STRINGS)
@@ -1342,7 +1344,7 @@ usbd_get_string(usbd_device_handle dev, int si, char *buf)
 		return (err);
 	s = buf;
 	n = size / 2 - 1;
-	for (i = 0; i < n; i++) {
+	for (i = 0; i < n && i < len - 1; i++) {
 		c = UGETW(us.bString[i]);
 		/* Convert from Unicode, handle buggy strings. */
 		if ((c & 0xff00) == 0)
diff --git a/sys/dev/usb/usbdi.h b/sys/dev/usb/usbdi.h
index 52f2a01f091c..b3b26cff757b 100644
--- a/sys/dev/usb/usbdi.h
+++ b/sys/dev/usb/usbdi.h
@@ -173,7 +173,8 @@ usbd_status usbd_reload_device_desc(usbd_device_handle);
 
 int usbd_ratecheck(struct timeval *last);
 
-usbd_status usbd_get_string(usbd_device_handle dev, int si, char *buf);
+usbd_status usbd_get_string(usbd_device_handle dev, int si, char *buf,
+    size_t len);
 
 /* An iterator for descriptors. */
 typedef struct {