From dfbdaf8f316e44ced774dfc89848e9471cbd6970 Mon Sep 17 00:00:00 2001
From: Martin Vierula <martin.vierula@trustwave.com>
Date: Wed, 8 Jun 2022 15:36:36 -0700
Subject: [PATCH] XML parser cleanup: NULL duplicate pointer

---
 apache2/msc_xml.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/apache2/msc_xml.c b/apache2/msc_xml.c
index 9cc4da65b..763ef399f 100644
--- a/apache2/msc_xml.c
+++ b/apache2/msc_xml.c
@@ -140,6 +140,9 @@ apr_status_t xml_cleanup(modsec_rec *msr) {
     if (msr->xml->parsing_ctx != NULL) {
         if (msr->xml->parsing_ctx->myDoc) {
             xmlFreeDoc(msr->xml->parsing_ctx->myDoc);
+            if (msr->xml->parsing_ctx->myDoc == msr->xml->doc) {
+                msr->xml->doc = NULL;
+            }
         }
         xmlFreeParserCtxt(msr->xml->parsing_ctx);
         msr->xml->parsing_ctx = NULL;