Always check variable type before using readdir to avoid surprises

3 files changed, 32 insertions, 25 deletions

diff --git a/lib/files/cache/scanner.php b/lib/files/cache/scanner.php
index 87fa7c1365a..9d180820e9d 100644
--- a/lib/files/cache/scanner.php
+++ b/lib/files/cache/scanner.php
@@ -159,20 +159,22 @@ class Scanner extends BasicEmitter {
 		$newChildren = array();
 		if ($this->storage->is_dir($path) && ($dh = $this->storage->opendir($path))) {
 			\OC_DB::beginTransaction();
-			while (($file = readdir($dh)) !== false) {
-				$child = ($path) ? $path . '/' . $file : $file;
-				if (!Filesystem::isIgnoredDir($file)) {
-					$newChildren[] = $file;
-					$data = $this->scanFile($child, $reuse, true);
-					if ($data) {
-						if ($data['size'] === -1) {
-							if ($recursive === self::SCAN_RECURSIVE) {
-								$childQueue[] = $child;
-							} else {
-								$size = -1;
+			if(is_resource($dh)) {
+				while (($file = readdir($dh)) !== false) {
+					$child = ($path) ? $path . '/' . $file : $file;
+					if (!Filesystem::isIgnoredDir($file)) {
+						$newChildren[] = $file;
+						$data = $this->scanFile($child, $reuse, true);
+						if ($data) {
+							if ($data['size'] === -1) {
+								if ($recursive === self::SCAN_RECURSIVE) {
+									$childQueue[] = $child;
+								} else {
+									$size = -1;
+								}
+							} else if ($size !== -1) {
+								$size += $data['size'];
 							}
-						} else if ($size !== -1) {
-							$size += $data['size'];
 						}
 					}
 				}
diff --git a/lib/files/storage/common.php b/lib/files/storage/common.php
index 01560f34fde..a5b79f0e967 100644
--- a/lib/files/storage/common.php
+++ b/lib/files/storage/common.php
@@ -142,13 +142,15 @@ abstract class Common implements \OC\Files\Storage\Storage {
 			return false;
 		} else {
 			$directoryHandle = $this->opendir($directory);
-			while (($contents = readdir($directoryHandle)) !== false) {
-				if (!\OC\Files\Filesystem::isIgnoredDir($contents)) {
-					$path = $directory . '/' . $contents;
-					if ($this->is_dir($path)) {
-						$this->deleteAll($path);
-					} else {
-						$this->unlink($path);
+			if(is_resource($directoryHandle)) {
+				while (($contents = readdir($directoryHandle)) !== false) {
+					if (!\OC\Files\Filesystem::isIgnoredDir($contents)) {
+						$path = $directory . '/' . $contents;
+						if ($this->is_dir($path)) {
+							$this->deleteAll($path);
+						} else {
+							$this->unlink($path);
+						}
 					}
 				}
 			}
@@ -224,7 +226,8 @@ abstract class Common implements \OC\Files\Storage\Storage {
 	}
 
 	private function addLocalFolder($path, $target) {
-		if ($dh = $this->opendir($path)) {
+		$dh = $this->opendir($path);
+		if(is_resource($dh)) {
 			while (($file = readdir($dh)) !== false) {
 				if ($file !== '.' and $file !== '..') {
 					if ($this->is_dir($path . '/' . $file)) {
@@ -242,7 +245,7 @@ abstract class Common implements \OC\Files\Storage\Storage {
 	protected function searchInDir($query, $dir = '') {
 		$files = array();
 		$dh = $this->opendir($dir);
-		if ($dh) {
+		if (is_resource($dh)) {
 			while (($item = readdir($dh)) !== false) {
 				if ($item == '.' || $item == '..') continue;
 				if (strstr(strtolower($item), strtolower($query)) !== false) {
diff --git a/lib/files/view.php b/lib/files/view.php
index 8aee12bf6fe..14de92c2005 100644
--- a/lib/files/view.php
+++ b/lib/files/view.php
@@ -500,9 +500,11 @@ class View {
 				} else {
 					if ($this->is_dir($path1) && ($dh = $this->opendir($path1))) {
 						$result = $this->mkdir($path2);
-						while (($file = readdir($dh)) !== false) {
-							if (!Filesystem::isIgnoredDir($file)) {
-								$result = $this->copy($path1 . '/' . $file, $path2 . '/' . $file);
+						if(is_resource($dh)) {
+							while (($file = readdir($dh)) !== false) {
+								if (!Filesystem::isIgnoredDir($file)) {
+									$result = $this->copy($path1 . '/' . $file, $path2 . '/' . $file);
+								}
 							}
 						}
 					} else {