File _service:tar_scm:Fix-Null-deref-in-xmlSchemaGet... of Package libxml2

File _service:tar_scm:Fix-Null-deref-in-xmlSchemaGetComponentTargetNs.patch of Package libxml2 (Revision a667da66ce83f00a021e50b071ea764d)

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From c3ae53279a37369d8b100b016126136dea05b44b Mon Sep 17 00:00:00 2001
From: huangduirong <huangduirong@huawei.com>
Date: Sat, 30 Oct 2021 15:21:01 +0800
Subject: [PATCH] fix null-deref in xmlSchemaGetComponentTargetNs

---
 xmlschemas.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/xmlschemas.c b/xmlschemas.c
index 5387c8e..17aa6df 100644
--- a/xmlschemas.c
+++ b/xmlschemas.c
@@ -1329,6 +1329,9 @@ xmlSchemaFormatQNameNs(xmlChar **buf, xmlNsPtr ns, const xmlChar *localName)
 static const xmlChar *
 xmlSchemaGetComponentName(xmlSchemaBasicItemPtr item)
 {
+    if (item == NULL) {
+        return (NULL);
+    }
     switch (item->type) {
 	case XML_SCHEMA_TYPE_ELEMENT:
 	    return (((xmlSchemaElementPtr) item)->name);
@@ -1384,6 +1387,9 @@ xmlSchemaGetQNameRefTargetNs(void *ref)
 static const xmlChar *
 xmlSchemaGetComponentTargetNs(xmlSchemaBasicItemPtr item)
 {
+    if (item == NULL) {
+        return (NULL);
+    }
     switch (item->type) {
 	case XML_SCHEMA_TYPE_ELEMENT:
 	    return (((xmlSchemaElementPtr) item)->targetNamespace);
-- 
1.8.3.1