Merge branch 'PHP-8.3' into PHP-8.4

* PHP-8.3:
  Fix phpGH-17500: Segfault with requesting nodeName on nameless doctype

Author: ndossche

NEWS

@@ -22,6 +22,8 @@ PHP                                                                        NEWS
   . Fixed bug GH-17486 (Incorrect error line numbers reported in
     Dom\HTMLDocument::createFromString). (nielsdos)
   . Fixed bug GH-17481 (UTF-8 corruption in \Dom\HTMLDocument). (nielsdos)
+  . Fixed bug GH-17500 (Segfault with requesting nodeName on nameless doctype).
+    (nielsdos)
 
 - Enchant:
   . Fix crashes in enchant when passing null bytes. (nielsdos)

ext/dom/node.c

@@ -102,11 +102,17 @@ zend_result dom_node_node_name_read(dom_object *obj, zval *retval)
 		}
 		case XML_DOCUMENT_TYPE_NODE:
 		case XML_DTD_NODE:
+			if (nodep->name) {
+				ZVAL_STRING(retval, (const char *) nodep->name);
+			} else {
+				ZVAL_EMPTY_STRING(retval);
+			}
+			break;
 		case XML_PI_NODE:
 		case XML_ENTITY_DECL:
 		case XML_ENTITY_REF_NODE:
 		case XML_NOTATION_NODE:
-			ZVAL_STRING(retval, (char *) nodep->name);
+			ZVAL_STRING(retval, (const char *) nodep->name);
 			break;
 		case XML_CDATA_SECTION_NODE:
 			ZVAL_STRING(retval, "#cdata-section");

ext/dom/tests/gh17500.phpt

@@ -0,0 +1,14 @@
+--TEST--
+GH-17500 (Segfault with requesting nodeName on nameless doctype)
+--EXTENSIONS--
+dom
+--FILE--
+<?php
+
+$doc = new DOMDocument();
+$doc->loadHTML("<!DOCTYPE>", LIBXML_NOERROR);
+var_dump($doc->doctype->nodeName);
+
+?>
+--EXPECT--
+string(0) ""