--- zzzz-none-000/linux-4.4.60/drivers/md/dm-table.c	2017-04-08 07:53:53.000000000 +0000
+++ scorpion-7490-727/linux-4.4.60/drivers/md/dm-table.c	2021-02-04 17:41:59.000000000 +0000
@@ -464,6 +464,16 @@
 	struct list_head *devices = &ti->table->devices;
 	struct dm_dev_internal *dd;
 
+	if (!ti) {
+		DMERR("%s: dm_target pointer is NULL", __func__);
+		return;
+	}
+
+	if (!d) {
+		DMERR("%s: dm_dev pointer is NULL", __func__);
+		return;
+	}
+
 	list_for_each_entry(dd, devices, list) {
 		if (dd->dm_dev == d) {
 			found = 1;