From e20c9c148c725e2933efa143ee6a543a5cae4204 Mon Sep 17 00:00:00 2001
From: Nick Wellnhofer <wellnhofer@aevum.de>
Date: Sat, 13 Mar 2021 18:41:47 +0100
Subject: [PATCH] Fix xmlGetNodePath with invalid node types

Make xmlGetNodePath return NULL instead of invalid XPath when hitting
unsupported node types like DTD content.

Reported here:
https://mail.gnome.org/archives/xml/2021-January/msg00012.html

Original report:
https://bugs.php.net/bug.php?id=80680
---
 tree.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tree.c b/tree.c
index dbc87aa..c707f59 100644
--- a/tree.c
+++ b/tree.c
@@ -4893,7 +4893,9 @@ xmlGetNodePath(const xmlNode *node)
             }
             next = ((xmlAttrPtr) cur)->parent;
         } else {
-            next = cur->parent;
+            xmlFree(buf);
+            xmlFree(buffer);
+            return (NULL);
         }
 
         /*
-- 
1.8.3.1