Always check variable type before using readdir to avoid surprises

4 files changed, 44 insertions, 33 deletions

diff --git a/apps/files_external/lib/amazons3.php b/apps/files_external/lib/amazons3.php
index 2d7bcd4ac37..c08a266b48c 100644
--- a/apps/files_external/lib/amazons3.php
+++ b/apps/files_external/lib/amazons3.php
@@ -183,17 +183,20 @@ class AmazonS3 extends \OC\Files\Storage\Common {
 		}
 
 		$dh = $this->opendir($path);
-		while (($file = readdir($dh)) !== false) {
-			if ($file === '.' || $file === '..') {
-				continue;
-			}
 
-			if ($this->is_dir($path . '/' . $file)) {
-				$this->rmdir($path . '/' . $file);
-			} else {
-				$this->unlink($path . '/' . $file);
+		if(is_resource($dh)) {
+			while (($file = readdir($dh)) !== false) {
+				if ($file === '.' || $file === '..') {
+					continue;
+				}
+
+				if ($this->is_dir($path . '/' . $file)) {
+					$this->rmdir($path . '/' . $file);
+				} else {
+					$this->unlink($path . '/' . $file);
+				}
 			}
-               	}
+		}
 
 		try {
 			$result = $this->connection->deleteObject(array(
@@ -464,15 +467,17 @@ class AmazonS3 extends \OC\Files\Storage\Common {
 			}
 
 			$dh = $this->opendir($path1);
-			while (($file = readdir($dh)) !== false) {
-				if ($file === '.' || $file === '..') {
-					continue;
+			if(is_resource($dh)) {
+				while (($file = readdir($dh)) !== false) {
+					if ($file === '.' || $file === '..') {
+						continue;
+					}
+
+					$source = $path1 . '/' . $file;
+					$target = $path2 . '/' . $file;
+					$this->copy($source, $target);
 				}
-
-				$source = $path1 . '/' . $file;
-				$target = $path2 . '/' . $file;
-				$this->copy($source, $target);
-                	}
+			}
 		}
 
 		return true;
diff --git a/apps/files_external/lib/google.php b/apps/files_external/lib/google.php
index 215bdcda6c2..b63b5885de1 100644
--- a/apps/files_external/lib/google.php
+++ b/apps/files_external/lib/google.php
@@ -206,14 +206,16 @@ class Google extends \OC\Files\Storage\Common {
 	public function rmdir($path) {
 		if (trim($path, '/') === '') {
 			$dir = $this->opendir($path);
-			while (($file = readdir($dh)) !== false) {
-				if (!\OC\Files\Filesystem::isIgnoredDir($file)) {
-					if (!$this->unlink($path.'/'.$file)) {
-						return false;
+			if(is_resource($dir)) {
+				while (($file = readdir($dir)) !== false) {
+					if (!\OC\Files\Filesystem::isIgnoredDir($file)) {
+						if (!$this->unlink($path.'/'.$file)) {
+							return false;
+						}
 					}
 				}
+				closedir($dir);
 			}
-			closedir($dir);
 			$this->driveFiles = array();
 			return true;
 		} else {
diff --git a/apps/files_external/lib/irods.php b/apps/files_external/lib/irods.php
index 7ec3b3a0cfc..f7279a6c5d2 100644
--- a/apps/files_external/lib/irods.php
+++ b/apps/files_external/lib/irods.php
@@ -55,7 +55,7 @@ class iRODS extends \OC\Files\Storage\StreamWrapper{
 		} else {
 			throw new \Exception();
 		}
-		
+
 	}
 
 	public static function login( $params ) {
@@ -137,11 +137,13 @@ class iRODS extends \OC\Files\Storage\StreamWrapper{
 	private function collectionMTime($path) {
 		$dh = $this->opendir($path);
 		$lastCTime = $this->filemtime($path);
-		while (($file = readdir($dh)) !== false) {
-			if ($file != '.' and $file != '..') {
-				$time = $this->filemtime($file);
-				if ($time > $lastCTime) {
-					$lastCTime = $time;
+		if(is_resource($dh)) {
+			while (($file = readdir($dh)) !== false) {
+				if ($file != '.' and $file != '..') {
+					$time = $this->filemtime($file);
+					if ($time > $lastCTime) {
+						$lastCTime = $time;
+					}
 				}
 			}
 		}
diff --git a/apps/files_external/lib/smb.php b/apps/files_external/lib/smb.php
index 8e7a28fba1a..ecd4dae0484 100644
--- a/apps/files_external/lib/smb.php
+++ b/apps/files_external/lib/smb.php
@@ -99,11 +99,13 @@ class SMB extends \OC\Files\Storage\StreamWrapper{
 	private function shareMTime() {
 		$dh=$this->opendir('');
 		$lastCtime=0;
-		while (($file = readdir($dh)) !== false) {
-			if ($file!='.' and $file!='..') {
-				$ctime=$this->filemtime($file);
-				if ($ctime>$lastCtime) {
-					$lastCtime=$ctime;
+		if(is_resource($dh)) {
+			while (($file = readdir($dh)) !== false) {
+				if ($file!='.' and $file!='..') {
+					$ctime=$this->filemtime($file);
+					if ($ctime>$lastCtime) {
+						$lastCtime=$ctime;
+					}
 				}
 			}
 		}