diff --git a/lib/list_sort.c b/lib/list_sort.c
index 291412a..fbdbc86 100644
--- a/lib/list_sort.c
+++ b/lib/list_sort.c
@@ -272,6 +272,11 @@
 		}
 		count++;
 	}
+	if (head.prev != cur) {
+		printk(KERN_ERR "list_sort_test: error: list is corrupted\n");
+		goto exit;
+	}
+
 
 	if (count != TEST_LIST_LEN) {
 		printk(KERN_ERR "list_sort_test: error: bad list length %d",