Fixed bug #62716 (munmap() is called with the incorrect length)

NEWS

@@ -3,6 +3,8 @@ PHP                                                                        NEWS
 ?? ??? 2012, PHP 5.3.16
 
 - Core:
+  . Fixed bug #62716 (munmap() is called with the incorrect length). 
+    (slangley@google.com)
   . Fixed bug #60194 (--with-zend-multibyte and --enable-debug reports LEAK
     with run-test.php). (Laruence)
 

Zend/zend_stream.c

@@ -79,7 +79,7 @@ static size_t zend_stream_stdio_fsizer(void *handle TSRMLS_DC) /* {{{ */
 static void zend_stream_unmap(zend_stream *stream TSRMLS_DC) { /* {{{ */
 #if HAVE_MMAP
 	if (stream->mmap.map) {
-		munmap(stream->mmap.map, stream->mmap.len);
+		munmap(stream->mmap.map, stream->mmap.len + ZEND_MMAP_AHEAD);
 	} else
 #endif
 	if (stream->mmap.buf) {