From 57d88da6757457b9dfa168c1f61a5b0850883850 Mon Sep 17 00:00:00 2001
From: Nick Wellnhofer <wellnhofer@aevum.de>
Date: Sun, 30 Apr 2023 21:30:21 +0200
Subject: schemas: Fix memory leak in xmlSchemaValidateStream

Regressed in 9a82b94a.

Fixes #530.
---
 xmlschemas.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/xmlschemas.c b/xmlschemas.c
index a4eaf591..4662ebbf 100644
--- a/xmlschemas.c
+++ b/xmlschemas.c
@@ -29098,9 +29098,18 @@ xmlSchemaValidateStream(xmlSchemaValidCtxtPtr ctxt,
     /*
      * prepare the parser
      */
-    pctxt = xmlNewSAXParserCtxt(sax, user_data);
-    if (pctxt == NULL)
-        return (-1);
+    if (sax != NULL) {
+        pctxt = xmlNewSAXParserCtxt(sax, user_data);
+        if (pctxt == NULL)
+            return (-1);
+    } else {
+        pctxt = xmlNewParserCtxt();
+        if (pctxt == NULL)
+            return (-1);
+        /* We really want pctxt->sax to be NULL here. */
+        xmlFree(pctxt->sax);
+        pctxt->sax = NULL;
+    }
 #if 0
     if (options)
         xmlCtxtUseOptions(pctxt, options);
-- 
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