Merge branch 'PHP-5.6' into PHP-7.0

NEWS

@@ -57,6 +57,7 @@ PHP                                                                        NEWS
 
 - XML:
   . Fixed bug #72085 (SEGV on unknown address zif_xml_parse). (cmb)
+  . Fixed bug #72714 (_xml_startElementHandler() segmentation fault). (cmb)
 
 - ZIP:
   . Fixed bug #68302 (impossible to compile php with zip support). (cmb)

ext/xml/tests/bug72714.phpt

@@ -0,0 +1,35 @@
+--TEST--
+Bug #72714 (_xml_startElementHandler() segmentation fault)
+--SKIPIF--
+<?php
+if (!extension_loaded('xml')) die('skip xml extension not available');
+?>
+--FILE--
+<?php
+function startElement($parser, $name, $attribs) {
+    var_dump($name);
+}
+
+function endElement($parser, $name) {}
+
+function parse($tagstart) {
+    $xml = '<ns1:total>867</ns1:total>';
+
+    $xml_parser = xml_parser_create();
+    xml_set_element_handler($xml_parser, 'startElement', 'endElement');
+
+    xml_parser_set_option($xml_parser, XML_OPTION_SKIP_TAGSTART, $tagstart);
+    xml_parse($xml_parser, $xml);
+
+    xml_parser_free($xml_parser);
+}
+
+parse(3015809298423721);
+parse(20);
+?>
+===DONE===
+--EXPECTF--
+Notice: xml_parser_set_option(): tagstart ignored in %s%ebug72714.php on line %d
+string(9) "NS1:TOTAL"
+string(0) ""
+===DONE===

ext/xml/xml.c

@@ -69,6 +69,10 @@ ZEND_GET_MODULE(xml)
 #endif /* COMPILE_DL_XML */
 /* }}} */
 
+
+#define SKIP_TAGSTART(str) ((str) + (parser->toffset > strlen(str) ? strlen(str) : + parser->toffset))
+
+
 /* {{{ function prototypes */
 PHP_MINIT_FUNCTION(xml);
 PHP_MINFO_FUNCTION(xml);
@@ -729,7 +733,7 @@ void _xml_startElementHandler(void *userData, const XML_Char *name, const XML_Ch
 
 		if (!Z_ISUNDEF(parser->startElementHandler)) {
 			ZVAL_COPY(&args[0], &parser->index);
-			ZVAL_STRING(&args[1], ZSTR_VAL(tag_name) + parser->toffset);
+			ZVAL_STRING(&args[1], SKIP_TAGSTART(ZSTR_VAL(tag_name)));
 			array_init(&args[2]);
 
 			while (attributes && *attributes) {
@@ -760,7 +764,7 @@ void _xml_startElementHandler(void *userData, const XML_Char *name, const XML_Ch
 
 				_xml_add_to_info(parser, ZSTR_VAL(tag_name) + parser->toffset);
 
-				add_assoc_string(&tag, "tag", ZSTR_VAL(tag_name) + parser->toffset); /* cast to avoid gcc-warning */
+				add_assoc_string(&tag, "tag", SKIP_TAGSTART(ZSTR_VAL(tag_name))); /* cast to avoid gcc-warning */
 				add_assoc_string(&tag, "type", "open");
 				add_assoc_long(&tag, "level", parser->level);
 
@@ -814,7 +818,7 @@ void _xml_endElementHandler(void *userData, const XML_Char *name)
 
 		if (!Z_ISUNDEF(parser->endElementHandler)) {
 			ZVAL_COPY(&args[0], &parser->index);
-			ZVAL_STRING(&args[1], ZSTR_VAL(tag_name) + parser->toffset);
+			ZVAL_STRING(&args[1], SKIP_TAGSTART(ZSTR_VAL(tag_name)));
 
 			xml_call_handler(parser, &parser->endElementHandler, parser->endElementPtr, 2, args, &retval);
 			zval_ptr_dtor(&retval);
@@ -830,7 +834,7 @@ void _xml_endElementHandler(void *userData, const XML_Char *name)
 
 				_xml_add_to_info(parser, ZSTR_VAL(tag_name) + parser->toffset);
 
-				add_assoc_string(&tag, "tag", ZSTR_VAL(tag_name) + parser->toffset); /* cast to avoid gcc-warning */
+				add_assoc_string(&tag, "tag", SKIP_TAGSTART(ZSTR_VAL(tag_name))); /* cast to avoid gcc-warning */
 				add_assoc_string(&tag, "type", "close");
 				add_assoc_long(&tag, "level", parser->level);
 
@@ -924,9 +928,9 @@ void _xml_characterDataHandler(void *userData, const XML_Char *s, int len)
 					if (parser->level <= XML_MAXLEVEL && parser->level > 0) {
 						array_init(&tag);
 
-						_xml_add_to_info(parser,parser->ltags[parser->level-1] + parser->toffset);
+						_xml_add_to_info(parser,SKIP_TAGSTART(parser->ltags[parser->level-1]));
 
-						add_assoc_string(&tag, "tag", parser->ltags[parser->level-1] + parser->toffset);
+						add_assoc_string(&tag, "tag", SKIP_TAGSTART(parser->ltags[parser->level-1]));
 						add_assoc_str(&tag, "value", decoded_value);
 						add_assoc_string(&tag, "type", "cdata");
 						add_assoc_long(&tag, "level", parser->level);
@@ -1605,6 +1609,10 @@ PHP_FUNCTION(xml_parser_set_option)
 		case PHP_XML_OPTION_SKIP_TAGSTART:
 			convert_to_long_ex(val);
 			parser->toffset = Z_LVAL_P(val);
+			if (parser->toffset < 0) {
+				php_error_docref(NULL TSRMLS_CC, E_NOTICE, "tagstart ignored");
+				parser->toffset = 0;
+			}
 			break;
 		case PHP_XML_OPTION_SKIP_WHITE:
 			convert_to_long_ex(val);