pythoncapi
diff --git a/‎Include/sysmodule.h‎
Lines changed: 1 addition & 1 deletion b/‎Include/sysmodule.h‎
Lines changed: 1 addition & 1 deletion
diff --git a/‎Lib/test/test_sys.py‎
Lines changed: 31 additions & 0 deletions b/‎Lib/test/test_sys.py‎
Lines changed: 31 additions & 0 deletions
diff --git a/‎Python/sysmodule.c‎
Lines changed: 10 additions & 5 deletions b/‎Python/sysmodule.c‎
Lines changed: 10 additions & 5 deletions
@@ -34,7 +34,7 @@ PyAPI_FUNC(void) PySys_AddXOption(const wchar_t *);
 PyAPI_FUNC(PyObject *) PySys_GetXOptions(void);
 
 #ifndef Py_LIMITED_API
-PyAPI_DATA(size_t) _PySys_GetSizeOf(PyObject *);
+PyAPI_FUNC(size_t) _PySys_GetSizeOf(PyObject *);
 #endif
 
 #ifdef __cplusplus
 
@@ -723,6 +723,37 @@ def test_gc_head_size(self):
         # but lists are
         self.assertEqual(sys.getsizeof([]), vsize('Pn') + gc_header_size)
 
+    def test_errors(self):
+        class BadSizeof:
+            def __sizeof__(self):
+                raise ValueError
+        self.assertRaises(ValueError, sys.getsizeof, BadSizeof())
+
+        class InvalidSizeof:
+            def __sizeof__(self):
+                return None
+        self.assertRaises(TypeError, sys.getsizeof, InvalidSizeof())
+        sentinel = ["sentinel"]
+        self.assertIs(sys.getsizeof(InvalidSizeof(), sentinel), sentinel)
+
+        class FloatSizeof:
+            def __sizeof__(self):
+                return 4.5
+        self.assertRaises(TypeError, sys.getsizeof, FloatSizeof())
+        self.assertIs(sys.getsizeof(FloatSizeof(), sentinel), sentinel)
+
+        class OverflowSizeof(int):
+            def __sizeof__(self):
+                return int(self)
+        self.assertEqual(sys.getsizeof(OverflowSizeof(sys.maxsize)),
+                         sys.maxsize + self.gc_headsize)
+        with self.assertRaises(OverflowError):
+            sys.getsizeof(OverflowSizeof(sys.maxsize + 1))
+        with self.assertRaises(ValueError):
+            sys.getsizeof(OverflowSizeof(-1))
+        with self.assertRaises((ValueError, OverflowError)):
+            sys.getsizeof(OverflowSizeof(-sys.maxsize - 1))
+
     def test_default(self):
         size = test.support.calcvobjsize
         self.assertEqual(sys.getsizeof(True), size('') + self.longdigit)
 
@@ -868,7 +868,7 @@ _PySys_GetSizeOf(PyObject *o)
 {
     PyObject *res = NULL;
     PyObject *method;
-    size_t size;
+    Py_ssize_t size;
 
     /* Make sure the type is initialized. float gets initialized late */
     if (PyType_Ready(Py_TYPE(o)) < 0)
@@ -889,15 +889,20 @@ _PySys_GetSizeOf(PyObject *o)
     if (res == NULL)
         return (size_t)-1;
 
-    size = PyLong_AsSize_t(res);
+    size = PyLong_AsSsize_t(res);
     Py_DECREF(res);
-    if (size == (size_t)-1 && PyErr_Occurred())
+    if (size == -1 && PyErr_Occurred())
+        return (size_t)-1;
+
+    if (size < 0) {
+        PyErr_SetString(PyExc_ValueError, "__sizeof__() should return >= 0");
         return (size_t)-1;
+    }
 
     /* add gc_head size */
     if (PyObject_IS_GC(o))
-        size += sizeof(PyGC_Head);
-    return size;
+        return ((size_t)size) + sizeof(PyGC_Head);
+    return (size_t)size;
 }
 
 static PyObject *