diff -ruN freebsd_orig/sys/dev/usb/input/uhid.c freebsd_13/sys/dev/usb/input/uhid.c
--- freebsd_orig/sys/dev/usb/input/uhid.c	2019-08-05 09:46:11.170388578 +0530
+++ freebsd_13/sys/dev/usb/input/uhid.c	2019-08-05 10:28:45.305146412 +0530
@@ -677,6 +677,9 @@
 	int error;
 	void *buf;
 	uint16_t len;
+	
+	if (uaa == NULL)
+		return (ENXIO);
 
 	DPRINTFN(11, "\n");
 
diff -ruN freebsd_orig/sys/dev/usb/storage/umass.c freebsd_13/sys/dev/usb/storage/umass.c
--- freebsd_orig/sys/dev/usb/storage/umass.c	2019-08-05 10:13:33.378982245 +0530
+++ freebsd_13/sys/dev/usb/storage/umass.c	2019-08-05 09:36:58.339765496 +0530
@@ -872,6 +872,9 @@
 	struct usb_attach_arg *uaa = device_get_ivars(dev);
 	struct umass_probe_proto temp;
 
+	if (uaa == NULL)
+		return (ENXIO);
+	
 	if (uaa->usb_mode != USB_MODE_HOST) {
 		return (ENXIO);
 	}
diff -ruN freebsd_orig/sys/dev/usb/usb_hub.c freebsd_13/sys/dev/usb/usb_hub.c
--- freebsd_orig/sys/dev/usb/usb_hub.c	2019-08-05 10:25:57.276874204 +0530
+++ freebsd_13/sys/dev/usb/usb_hub.c	2019-08-05 08:18:08.537617812 +0530
@@ -1111,6 +1111,9 @@
 {
 	struct usb_attach_arg *uaa = device_get_ivars(dev);
 
+	if (uaa == NULL)
+		return (ENXIO);
+
 	if (uaa->usb_mode != USB_MODE_HOST)
 		return (ENXIO);
 
diff -ruN freebsd_orig/sys/dev/usb/wlan/if_run.c freebsd_13/sys/dev/usb/wlan/if_run.c
--- freebsd_orig/sys/dev/usb/wlan/if_run.c	2019-08-05 10:13:33.398982487 +0530
+++ freebsd_13/sys/dev/usb/wlan/if_run.c	2019-08-05 09:36:08.982716789 +0530
@@ -720,6 +720,8 @@
 {
 	struct usb_attach_arg *uaa = device_get_ivars(self);
 
+	if (uaa == NULL)
+		return (ENXIO);
 	if (uaa->usb_mode != USB_MODE_HOST)
 		return (ENXIO);
 	if (uaa->info.bConfigIndex != 0)
diff -ruN freebsd_orig/sys/netgraph/bluetooth/drivers/ubt/ng_ubt.c freebsd_13/sys/netgraph/bluetooth/drivers/ubt/ng_ubt.c
--- freebsd_orig/sys/netgraph/bluetooth/drivers/ubt/ng_ubt.c	2019-08-05 10:13:33.318981516 +0530
+++ freebsd_13/sys/netgraph/bluetooth/drivers/ubt/ng_ubt.c	2019-08-05 09:33:46.941575792 +0530
@@ -513,6 +513,9 @@
 	struct usb_attach_arg	*uaa = device_get_ivars(dev);
 	int error;
 
+	if (uaa == NULL)
+		return (ENXIO);
+
 	if (uaa->usb_mode != USB_MODE_HOST)
 		return (ENXIO);