From 9ed4f515d16ccacacffa5092b39f55ba5322054d Mon Sep 17 00:00:00 2001
From: Antony Dovgal <tony2001@php.net>
Date: Wed, 29 Nov 2006 11:10:49 +0000
Subject: [PATCH] fix #39673 (file_get_contents causes bus error on certain
 offsets)

---
 ext/standard/tests/file/bug39673.phpt | 40 +++++++++++++++++++++++++++
 main/streams/plain_wrapper.c          |  7 +++++
 2 files changed, 47 insertions(+)
 create mode 100644 ext/standard/tests/file/bug39673.phpt

diff --git a/ext/standard/tests/file/bug39673.phpt b/ext/standard/tests/file/bug39673.phpt
new file mode 100644
index 0000000000..3836f2103d
--- /dev/null
+++ b/ext/standard/tests/file/bug39673.phpt
@@ -0,0 +1,40 @@
+--TEST--
+Bug #39673 (file_get_contents causes bus error on certain offsets)
+--FILE--
+<?php
+
+$str = str_repeat("test", 3456);
+
+$filename = dirname(__FILE__).'/bug39673.txt';
+file_put_contents($filename, $str);
+
+$offsets = array(
+	-1,
+	0,
+	3456*4,
+	3456*4 - 1,
+	3456*4 + 1,
+	2000,
+	5000,
+	100000,
+);
+
+
+foreach ($offsets as $offset) {
+	$r = file_get_contents($filename, false, null, $offset);
+	var_dump(strlen($r));
+}
+
+@unlink($filename);
+echo "Done\n";
+?>
+--EXPECTF--	
+int(13824)
+int(13824)
+int(0)
+int(1)
+int(0)
+int(11824)
+int(8824)
+int(0)
+Done
diff --git a/main/streams/plain_wrapper.c b/main/streams/plain_wrapper.c
index 1b9e1c2501..979725d590 100644
--- a/main/streams/plain_wrapper.c
+++ b/main/streams/plain_wrapper.c
@@ -631,9 +631,16 @@ static int php_stdiop_set_option(php_stream *stream, int option, int value, void
 
 					case PHP_STREAM_MMAP_MAP_RANGE:
 						do_fstat(data, 1);
+						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) {
+							range->offset = data->sb.st_size;
+							range->length = 0;
+						}
 						switch (range->mode) {
 							case PHP_STREAM_MAP_MODE_READONLY:
 								prot = PROT_READ;
-- 
2.50.1