From b67c690498804130b9fcf2e5b21f70317104fac7 Mon Sep 17 00:00:00 2001
From: Bob4ever <kresse6@hotmail.com>
Date: Thu, 15 Oct 2015 17:22:21 +0200
Subject: [PATCH 1/2] Fixed a bug in SFTP::chmod not using realpath on the
 filepath

---
 phpseclib/Net/SFTP.php | 1 +
 1 file changed, 1 insertion(+)

diff --git a/phpseclib/Net/SFTP.php b/phpseclib/Net/SFTP.php
index b056628f..361aac78 100644
--- a/phpseclib/Net/SFTP.php
+++ b/phpseclib/Net/SFTP.php
@@ -1454,6 +1454,7 @@ class Net_SFTP extends Net_SSH2
             return true;
         }
 
+        $filename = $this->_realPath($filename);
         // rather than return what the permissions *should* be, we'll return what they actually are.  this will also
         // tell us if the file actually exists.
         // incidentally, SFTPv4+ adds an additional 32-bit integer field - flags - to the following:

From 579e51c58f07a5ba4e58c574e2e9a8d30c58455a Mon Sep 17 00:00:00 2001
From: Andreas Fischer <bantu@phpbb.com>
Date: Mon, 19 Oct 2015 00:06:41 +0200
Subject: [PATCH 2/2] Add test case for GitHub Issue 850: Realpath in SFTP
 chmod().

---
 tests/Functional/Net/SFTPUserStoryTest.php | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/tests/Functional/Net/SFTPUserStoryTest.php b/tests/Functional/Net/SFTPUserStoryTest.php
index 770ad95b..c01948f4 100644
--- a/tests/Functional/Net/SFTPUserStoryTest.php
+++ b/tests/Functional/Net/SFTPUserStoryTest.php
@@ -238,6 +238,20 @@ class Functional_Net_SFTPUserStoryTest extends PhpseclibFunctionalTestCase
 
     /**
      * @depends testTruncate
+     * @group github850
+     */
+    public function testChModOnFile($sftp)
+    {
+        $this->assertNotFalse(
+            $sftp->chmod(0755, 'file1.txt'),
+            'Failed asserting that chmod() was successful.'
+        );
+
+        return $sftp;
+    }
+
+    /**
+     * @depends testChModOnFile
      */
     public function testChDirOnFile($sftp)
     {