From 5a02583c7e683896d84878bd90641d8d9b0d0549 Mon Sep 17 00:00:00 2001
From: Zhipeng Xie <xiezhipeng1@huawei.com>
Date: Wed, 7 Aug 2019 17:39:17 +0800
Subject: [PATCH] Fix memory leak in xmlParseBalancedChunkMemoryRecover

When doc is NULL, namespace created in xmlTreeEnsureXMLDecl
is bind to newDoc->oldNs, in this case, set newDoc->oldNs to
NULL and free newDoc will cause a memory leak.

Found with libFuzzer.

Closes #82.
---
 parser.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/parser.c b/parser.c
index 1ce1ccf1..26d9f4e3 100644
--- a/parser.c
+++ b/parser.c
@@ -13894,7 +13894,8 @@ xmlParseBalancedChunkMemoryRecover(xmlDocPtr doc, xmlSAXHandlerPtr sax,
     xmlFreeParserCtxt(ctxt);
     newDoc->intSubset = NULL;
     newDoc->extSubset = NULL;
-    newDoc->oldNs = NULL;
+    if(doc != NULL)
+	newDoc->oldNs = NULL;
     xmlFreeDoc(newDoc);
 
     return(ret);
-- 
2.24.1