Merge branch 'PHP-7.4'

* PHP-7.4:
  Fixed bug #79468

Author: nikic

ext/standard/tests/filters/bug79468.phpt

@@ -0,0 +1,21 @@
+--TEST--
+Bug #79468	SIGSEGV when closing stream handle with a stream filter appended
+--SKIPIF--
+<?php
+$filters = stream_get_filters();
+if(! in_array( "string.rot13", $filters )) die( "skip rot13 filter not available." );
+?>
+--FILE--
+<?php
+$fp = fopen('php://temp', 'rb');
+$rot13_filter = stream_filter_append($fp, "string.rot13", STREAM_FILTER_WRITE);
+fwrite($fp, "This is ");
+fclose($fp);
+try {
+    stream_filter_remove($rot13_filter);
+} catch (\Throwable $e) {
+    var_dump($e->getMessage());
+}
+?>
+--EXPECT--
+string(79) "stream_filter_remove(): supplied resource is not a valid stream filter resource"

main/streams/streams.c

@@ -485,9 +485,15 @@ fprintf(stderr, "stream_free: %s:%p[%s] preserve_handle=%d release_cast=%d remov
 
 	if (close_options & PHP_STREAM_FREE_RELEASE_STREAM) {
 		while (stream->readfilters.head) {
+			if (stream->readfilters.head->res != NULL) {
+				zend_list_close(stream->readfilters.head->res);
+			}
 			php_stream_filter_remove(stream->readfilters.head, 1);
 		}
 		while (stream->writefilters.head) {
+			if (stream->writefilters.head->res != NULL) {
+				zend_list_close(stream->writefilters.head->res);
+			}
 			php_stream_filter_remove(stream->writefilters.head, 1);
 		}