Fixed bug #69100

Author: nikic

NEWS

@@ -2,6 +2,10 @@ PHP                                                                        NEWS
 |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
 ?? ??? 2019, PHP 7.2.22
 
+- Standard:
+  . Fixed bug #69100 (Bus error from stream_copy_to_stream (file -> SSL stream)
+    with invalid length). (Nikita)
+
 01 Aug 2019, PHP 7.2.21
 
 - Fileinfo:

ext/standard/tests/file/bug69100.phpt

@@ -0,0 +1,24 @@
+--TEST--
+Bug #69100: Bus error from stream_copy_to_stream (file -> SSL stream) with invalid length
+--FILE--
+<?php
+
+$fileIn = __DIR__ . '/bug69100_in.txt';
+$fileOut = __DIR__ . '/bug69100_out.txt';
+
+file_put_contents($fileIn, str_repeat('A', 64 * 1024));
+$fr = fopen($fileIn, 'rb');
+$fw = fopen($fileOut, 'w');
+
+var_dump(stream_copy_to_stream($fr, $fw, 32 * 1024));
+var_dump(stream_copy_to_stream($fr, $fw, 64 * 1024));
+
+fclose($fr);
+fclose($fw);
+unlink($fileIn);
+unlink($fileOut);
+
+?>
+--EXPECT--
+int(32768)
+int(32768)

main/streams/plain_wrapper.c

@@ -696,18 +696,15 @@ static int php_stdiop_set_option(php_stream *stream, int option, int value, void
 						return fd == -1 ? PHP_STREAM_OPTION_RETURN_ERR : PHP_STREAM_OPTION_RETURN_OK;
 
 					case PHP_STREAM_MMAP_MAP_RANGE:
-						if(do_fstat(data, 1) != 0) {
+						if (do_fstat(data, 1) != 0) {
 							return PHP_STREAM_OPTION_RETURN_ERR;
 						}
-						if (range->length == 0 && range->offset > 0 && range->offset < data->sb.st_size) {
-							range->length = data->sb.st_size - range->offset;
-						}
-						if (range->length == 0 || range->length > data->sb.st_size) {
-							range->length = data->sb.st_size;
-						}
-						if (range->offset >= data->sb.st_size) {
+						if (range->offset > data->sb.st_size) {
 							range->offset = data->sb.st_size;
-							range->length = 0;
+						}
+						if (range->length == 0 ||
+								range->length > data->sb.st_size - range->offset) {
+							range->length = data->sb.st_size - range->offset;
 						}
 						switch (range->mode) {
 							case PHP_STREAM_MAP_MODE_READONLY: