included more checks for file access errors

1 files changed, 10 insertions, 1 deletions

diff --git a/Auth/OpenID/FileStore.php b/Auth/OpenID/FileStore.php
index 074421a..7eec791 100644
--- a/Auth/OpenID/FileStore.php
+++ b/Auth/OpenID/FileStore.php
@@ -300,13 +300,22 @@ class Auth_OpenID_FileStore extends Auth_OpenID_OpenIDStore {
             return null;
         }
 
+        if (file_exists($filename) !== true) {
+            return null;
+        }
+
         $assoc_file = @fopen($filename, 'rb');
 
         if ($assoc_file === false) {
             return null;
         }
 
-        $assoc_s = fread($assoc_file, filesize($filename));
+        $filesize = filesize($filename);
+        if ($filesize === false || $filesize <= 0) {
+            return null;
+        }
+
+        $assoc_s = fread($assoc_file, $filesize);
         fclose($assoc_file);
 
         if (!$assoc_s) {