diff --git a/src/Symfony/Component/ClassLoader/ClassCollectionLoader.php b/src/Symfony/Component/ClassLoader/ClassCollectionLoader.php
index 5d09848952e8e..6f88286de0ff5 100644
--- a/src/Symfony/Component/ClassLoader/ClassCollectionLoader.php
+++ b/src/Symfony/Component/ClassLoader/ClassCollectionLoader.php
@@ -275,7 +275,13 @@ private static function compressCode($code)
*/
private static function writeCacheFile($file, $content)
{
- $tmpFile = tempnam(dirname($file), basename($file));
+ $dir = dirname($file);
+ if (!is_writable($dir)) {
+ throw new \RuntimeException(sprintf('Cache directory "%s" is not writable.', $dir));
+ }
+
+ $tmpFile = tempnam($dir, basename($file));
+
if (false !== @file_put_contents($tmpFile, $content) && @rename($tmpFile, $file)) {
@chmod($file, 0666 & ~umask());
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