From bd6fa2c1d5c163ab94edaf2e62d18cdfee33f913 Mon Sep 17 00:00:00 2001
From: Nick Wellnhofer <wellnhofer@aevum.de>
Date: Thu, 9 Mar 2023 22:33:19 +0100
Subject: [PATCH] malloc-fail: Fix memory leak in xmlXPathRegisterNs

Found by OSS-Fuzz.

Reference:https://github.com/GNOME/libxml2/commit/bd6fa2c1d5c163ab94edaf2e62d18cdfee33f913
Conflict:NA
---
 xpath.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/xpath.c b/xpath.c
index 56a59c1..e3a8c14 100644
--- a/xpath.c
+++ b/xpath.c
@@ -5133,6 +5133,8 @@ xmlXPathRegisteredVariablesCleanup(xmlXPathContextPtr ctxt) {
 int
 xmlXPathRegisterNs(xmlXPathContextPtr ctxt, const xmlChar *prefix,
 			   const xmlChar *ns_uri) {
+    xmlChar *copy;
+
     if (ctxt == NULL)
 	return(-1);
     if (prefix == NULL)
@@ -5147,8 +5149,17 @@ xmlXPathRegisterNs(xmlXPathContextPtr ctxt, const xmlChar *prefix,
     if (ns_uri == NULL)
         return(xmlHashRemoveEntry(ctxt->nsHash, prefix,
 	                          xmlHashDefaultDeallocator));
-    return(xmlHashUpdateEntry(ctxt->nsHash, prefix, (void *) xmlStrdup(ns_uri),
-			      xmlHashDefaultDeallocator));
+
+    copy = xmlStrdup(ns_uri);
+    if (copy == NULL)
+        return(-1);
+    if (xmlHashUpdateEntry(ctxt->nsHash, prefix, copy,
+                           xmlHashDefaultDeallocator) < 0) {
+        xmlFree(copy);
+        return(-1);
+    }
+
+    return(0);
 }
 
 /**
-- 
2.27.0