Merge branch 'PHP-8.3'

* PHP-8.3:
  Fix GH-11078: PHP Fatal error triggers pointer being freed was not allocated and malloc: double free for ptr errors

ext/zend_test/test.c

@@ -774,6 +774,38 @@ static ZEND_FUNCTION(zend_test_set_fmode)
 }
 #endif
 
+static ZEND_FUNCTION(zend_test_cast_fread)
+{
+	zval *stream_zv;
+	php_stream *stream;
+	FILE *fp;
+
+	ZEND_PARSE_PARAMETERS_START(1, 1)
+		Z_PARAM_RESOURCE(stream_zv);
+	ZEND_PARSE_PARAMETERS_END();
+
+	php_stream_from_zval(stream, stream_zv);
+
+	if (php_stream_cast(stream, PHP_STREAM_AS_STDIO, (void *) &fp, REPORT_ERRORS) == FAILURE) {
+		return;
+	}
+
+	size_t size = 10240; /* Must be large enough to trigger the issue */
+	char *buf = malloc(size);
+	bool bail = false;
+	zend_try {
+		(void) !fread(buf, 1, size, fp);
+	} zend_catch {
+		bail = true;
+	} zend_end_try();
+
+	free(buf);
+
+	if (bail) {
+		zend_bailout();
+	}
+}
+
 static zend_object *zend_test_class_new(zend_class_entry *class_type)
 {
 	zend_object *obj = zend_objects_new(class_type);

ext/zend_test/test.stub.php

@@ -281,6 +281,9 @@ function zend_test_is_pcre_bundled(): bool {}
 #if defined(PHP_WIN32)
     function zend_test_set_fmode(bool $binary): void {}
 #endif
+
+    /** @param resource $stream */
+    function zend_test_cast_fread($stream): void {}
 }
 
 namespace ZendTestNS {

ext/zend_test/tests/gh11078.phpt

@@ -0,0 +1,34 @@
+--TEST--
+GH-11078 (PHP Fatal error triggers pointer being freed was not allocated and malloc: double free for ptr errors)
+--EXTENSIONS--
+zend_test
+--SKIPIF--
+<?php
+if (getenv('USE_ZEND_ALLOC') === '0') die('skip Zend MM disabled');
+if (PHP_OS_FAMILY === 'Windows') die('skip Windows does not support generic stream casting');
+?>
+--FILE--
+<?php
+
+const MEM = 32 * 1024 * 1024;
+ini_set('memory_limit', MEM);
+
+class CrashingFifo {
+    public $context;
+
+    function stream_open($path, $mode, $options, &$opened_path): bool {
+        return true;
+    }
+
+    function stream_read(int $count): false|string|null {
+        return str_repeat('x', MEM);
+    }
+}
+
+stream_register_wrapper('fifo', CrashingFifo::class);
+$readStream = fopen('fifo://1', 'r');
+zend_test_cast_fread($readStream);
+
+?>
+--EXPECTF--
+Fatal error: Allowed memory size of %d bytes exhausted %s

main/streams/cast.c

@@ -46,7 +46,14 @@ typedef struct {
 
 FILE *fopencookie(void *cookie, const char *mode, cookie_io_functions_t *funcs)
 {
-	return funopen(cookie, funcs->reader, funcs->writer, funcs->seeker, funcs->closer);
+	FILE *file = funopen(cookie, funcs->reader, funcs->writer, funcs->seeker, funcs->closer);
+	if (file) {
+		/* Buffering of FILE handles is stateful.
+		 * A bailout during these can corrupt the state of the FILE handle
+		 * and cause memory corruption errors. See GH-11078. */
+		setvbuf(file, NULL, _IONBF, 0);
+	}
+	return file;
 }
 # define HAVE_FOPENCOOKIE 1
 # define PHP_EMULATE_FOPENCOOKIE 1