Index: Python/getargs.c
===================================================================
--- Python/getargs.c	(Revision 72701)
+++ Python/getargs.c	(Arbeitskopie)
@@ -141,6 +141,7 @@
 
 #define GETARGS_CAPSULE_NAME_CLEANUP_PTR "getargs.cleanup_ptr"
 #define GETARGS_CAPSULE_NAME_CLEANUP_BUFFER "getargs.cleanup_buffer"
+#define GETARGS_CAPSULE_NAME_CLEANUP_CONVERT "getargs.cleanup_convert"
 
 static void
 cleanup_ptr(PyObject *self)
@@ -194,7 +195,48 @@
 	return 0;
 }
 
+static void
+cleanup_convert(PyObject *self)
+{
+	typedef int (*destr_t)(PyObject *, void *);
+	destr_t destr = (destr_t)PyCapsule_GetContext(self);
+	void *ptr = PyCapsule_GetPointer(self,
+					 GETARGS_CAPSULE_NAME_CLEANUP_CONVERT);
+	if (ptr && destr)
+		destr(NULL, ptr);
+}
+
 static int
+addcleanup_convert(void *ptr, PyObject **freelist, int (*destr)(PyObject*,void*))
+{
+	PyObject *cobj;
+	if (!*freelist) {
+		*freelist = PyList_New(0);
+		if (!*freelist) {
+			destr(NULL, ptr);
+			return -1;
+		}
+	}
+	cobj = PyCapsule_New(ptr, GETARGS_CAPSULE_NAME_CLEANUP_CONVERT, 
+			     cleanup_convert);
+	if (!cobj) {
+		destr(NULL, ptr);
+		return -1;
+	}
+	if (PyCapsule_SetContext(cobj, destr) == -1) {
+		/* This really should not happen. */
+		Py_FatalError("capsule refused setting of context.");
+		return -1;
+	}
+	if (PyList_Append(*freelist, cobj)) {
+		Py_DECREF(cobj);
+		return -1;
+	}
+        Py_DECREF(cobj);
+	return 0;
+}
+
+static int
 cleanreturn(int retval, PyObject *freelist)
 {
 	if (freelist && retval != 0) {
@@ -1253,10 +1295,15 @@
 			typedef int (*converter)(PyObject *, void *);
 			converter convert = va_arg(*p_va, converter);
 			void *addr = va_arg(*p_va, void *);
+			int res;
 			format++;
-			if (! (*convert)(arg, addr))
+			if (! (res = (*convert)(arg, addr)))
 				return converterr("(unspecified)",
 						  arg, msgbuf, bufsize);
+			if (res == Py_CLEANUP_SUPPORTED &&
+			    addcleanup_convert(addr, freelist, convert) == -1)
+				return converterr("(cleanup problem)",
+						arg, msgbuf, bufsize);
 		}
 		else {
 			p = va_arg(*p_va, PyObject **);
Index: Include/modsupport.h
===================================================================
--- Include/modsupport.h	(Revision 72701)
+++ Include/modsupport.h	(Arbeitskopie)
@@ -43,6 +43,8 @@
 #define PyModule_AddIntMacro(m, c) PyModule_AddIntConstant(m, #c, c)
 #define PyModule_AddStringMacro(m, c) PyModule_AddStringConstant(m, #c, c)
 
+#define Py_CLEANUP_SUPPORTED 0x20000
+
 #define PYTHON_API_VERSION 1013
 #define PYTHON_API_STRING "1013"
 /* The API version is maintained (independently from the Python version)
Index: Objects/unicodeobject.c
===================================================================
--- Objects/unicodeobject.c	(Revision 72701)
+++ Objects/unicodeobject.c	(Arbeitskopie)
@@ -1539,6 +1539,10 @@
     PyObject *output = NULL;
     Py_ssize_t size;
     void *data;
+    if (arg == NULL) {
+        Py_DECREF(*(PyObject**)addr);
+        return 1;
+    }
     if (PyBytes_Check(arg) || PyByteArray_Check(arg)) {
         output = arg;
         Py_INCREF(output);
@@ -1573,7 +1577,7 @@
         return 0;
     }
     *(PyObject**)addr = output;
-    return 1;
+    return Py_CLEANUP_SUPPORTED;
 }
 
 
Index: Modules/posixmodule.c
===================================================================
--- Modules/posixmodule.c	(Revision 72701)
+++ Modules/posixmodule.c	(Arbeitskopie)
@@ -787,8 +787,6 @@
 	if (!PyArg_ParseTuple(args, format,
 	                      PyUnicode_FSConverter, &opath1,
 	                      PyUnicode_FSConverter, &opath2)) {
-		Py_XDECREF(opath1);
-		Py_XDECREF(opath2);
 		return NULL;
 	}
 	path1 = bytes2str(opath1, 1);