diff --git a/hardware/fx2lafw/fx2lafw.c b/hardware/fx2lafw/fx2lafw.c
index a6817340..b05334a3 100644
--- a/hardware/fx2lafw/fx2lafw.c
+++ b/hardware/fx2lafw/fx2lafw.c
@@ -385,6 +385,7 @@ static int clear_instances(void)
 			continue;
 		}
 		hw_dev_close(sdi);
+		sr_usb_dev_inst_free(devc->usb);
 		sdi = l->data;
 		sr_dev_inst_free(sdi);
 	}
diff --git a/hardware/genericdmm/api.c b/hardware/genericdmm/api.c
index 5c868a4d..42136017 100644
--- a/hardware/genericdmm/api.c
+++ b/hardware/genericdmm/api.c
@@ -422,6 +422,7 @@ static int hw_cleanup(void)
 			switch (devc->profile->transport) {
 			case DMM_TRANSPORT_USBHID:
 				/* TODO */
+				sr_usb_dev_inst_free(devc->usb);
 				break;
 			case DMM_TRANSPORT_SERIAL:
 				if (devc->serial && devc->serial->fd != -1)
diff --git a/hardware/zeroplus-logic-cube/zeroplus.c b/hardware/zeroplus-logic-cube/zeroplus.c
index 94ce37e1..7dcda9cf 100644
--- a/hardware/zeroplus-logic-cube/zeroplus.c
+++ b/hardware/zeroplus-logic-cube/zeroplus.c
@@ -232,10 +232,17 @@ static void clear_instances(void)
 	GSList *l;
 	struct sr_dev_inst *sdi;
 	struct drv_context *drvc;
+	struct dev_context *devc;
 
 	drvc = zdi->priv;
 	for (l = drvc->instances; l; l = l->next) {
 		sdi = l->data;
+		if (!(devc = sdi->priv)) {
+			/* Log error, but continue cleaning up the rest. */
+			sr_err("zeroplus: %s: sdi->priv was NULL, continuing", __func__);
+			continue;
+		}
+		sr_usb_dev_inst_free(devc->usb);
 		/* Properly close all devices... */
 		hw_dev_close(sdi);
 		/* ...and free all their memory. */