From 2f997b169a6de6eee968e6cd795f308ce536f552 Mon Sep 17 00:00:00 2001
From: Vladimir Ratnikov <vratnikov@netgate.com>
Date: Thu, 25 Apr 2019 06:20:15 -0400
Subject: [PATCH] Add yang_stmt NULL check in yang_order to prevent SEGFAULT

---
 lib/src/clixon_yang.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/src/clixon_yang.c b/lib/src/clixon_yang.c
index 25722f11..4f58c9fd 100644
--- a/lib/src/clixon_yang.c
+++ b/lib/src/clixon_yang.c
@@ -850,6 +850,10 @@ yang_order(yang_stmt *y)
      * if so, the real parent (from an xml point of view) is the parents
      * parent. 
      */
+    if (y == NULL){
+	    return -1;
+    }
+
     yp = y->ys_parent;
     while (yp->ys_keyword == Y_CASE || yp->ys_keyword == Y_CHOICE)
 	yp = yp->ys_parent;