From 293067bc3e9cafbea2fde83c5e8af63a4eff33a2 Mon Sep 17 00:00:00 2001
From: Nick Wellnhofer <wellnhofer@aevum.de>
Date: Sun, 26 Feb 2023 16:53:25 +0100
Subject: [PATCH] malloc-fail: Fix null deref in exsltFuncShutdown

Found with libFuzzer, see #84.
---
 libexslt/functions.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/libexslt/functions.c b/libexslt/functions.c
index f9fbb8bd..dc9bdb71 100644
--- a/libexslt/functions.c
+++ b/libexslt/functions.c
@@ -185,9 +185,11 @@ exsltFuncShutdown (xsltTransformContextPtr ctxt ATTRIBUTE_UNUSED,
 		   void *vdata) {
     exsltFuncData *data = (exsltFuncData *) vdata;
 
-    if (data->result != NULL)
-	xmlXPathFreeObject(data->result);
-    xmlFree(data);
+    if (data != NULL) {
+        if (data->result != NULL)
+            xmlXPathFreeObject(data->result);
+        xmlFree(data);
+    }
 }
 
 /**