From 95eaccd0bb901495323c36282d4e783556be1964 Mon Sep 17 00:00:00 2001
From: dinosaur <thedinosaurmail@gmail.com>
Date: Tue, 14 Apr 2020 07:46:34 +0800
Subject: [PATCH] Fixed bug #79468

Close the stream filter resources when removing them from the stream.
---
 NEWS                                     |  4 ++++
 ext/standard/tests/filters/bug79468.phpt | 21 +++++++++++++++++++++
 main/streams/streams.c                   |  6 ++++++
 3 files changed, 31 insertions(+)
 create mode 100644 ext/standard/tests/filters/bug79468.phpt

diff --git a/NEWS b/NEWS
index 9ebfbf16273..95e520e32ac 100644
--- a/NEWS
+++ b/NEWS
@@ -14,6 +14,10 @@ PHP                                                                        NEWS
   . Fixed bug #79441 (Segfault in mb_chr() if internal encoding is unsupported).
     (Girgias)
 
+- Standard:
+  . Fixed bug #79468 (SIGSEGV when closing stream handle with a stream filter
+    appended). (dinosaur)
+
 16 Apr 2020, PHP 7.3.17
 
 - Core:
diff --git a/ext/standard/tests/filters/bug79468.phpt b/ext/standard/tests/filters/bug79468.phpt
new file mode 100644
index 00000000000..60a848ec016
--- /dev/null
+++ b/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());
+}
+?>
+--EXPECTF--
+Warning: stream_filter_remove(): Invalid resource given, not a stream filter in %s on line %d
diff --git a/main/streams/streams.c b/main/streams/streams.c
index 5daf4fe83de..fb9c6800739 100644
--- a/main/streams/streams.c
+++ b/main/streams/streams.c
@@ -476,9 +476,15 @@ 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);
 		}