diff -r ce6a6cc3765d Modules/posixmodule.c
--- a/Modules/posixmodule.c	Tue Dec 20 22:52:33 2016 +0800
+++ b/Modules/posixmodule.c	Wed Dec 21 18:24:26 2016 +0800
@@ -1012,6 +1012,7 @@
         length
     );
     if (!wo) {
+        Py_DECREF(bytes);
         goto exit;
     }
 
@@ -1019,14 +1020,17 @@
     Py_DECREF(wo);
 
     if (!wide) {
+        Py_DECREF(bytes);
         goto exit;
     }
     if (length > 32767) {
         FORMAT_EXCEPTION(PyExc_ValueError, "%s too long for Windows");
+        Py_DECREF(bytes);
         goto exit;
     }
     if (wcslen(wide) != length) {
         FORMAT_EXCEPTION(PyExc_ValueError, "embedded null character in %s");
+        Py_DECREF(bytes);
         goto exit;
     }
     path->wide = wide;