diff -r e5427b0b2bf7 Modules/_stat.c
--- a/Modules/_stat.c	Sun Jun 23 01:49:42 2013 +0200
+++ b/Modules/_stat.c	Sun Jun 23 13:50:14 2013 +0200
@@ -395,10 +395,17 @@ static PyObject *
 stat_filemode(PyObject *self, PyObject *omode)
 {
     char buf[10];
-    unsigned long mode;
+    unsigned long mode_long;
+    mode_t mode;
 
-    mode = PyLong_AsUnsignedLong(omode);
-    if ((mode == (unsigned long)-1) && PyErr_Occurred()) {
+    mode_long = PyLong_AsUnsignedLong(omode);
+    if ((mode_long == (unsigned long)-1) && PyErr_Occurred()) {
+        return NULL;
+    }
+    mode = (mode_t)mode_long;
+    if ((long)mode != mode_long) {
+        PyErr_SetString(PyExc_OverflowError,
+                        "mode out of range");
         return NULL;
     }