Issue #11286: Raise a ValueError from calling PyMemoryView_FromBuffer with

a buffer struct having a NULL data pointer.

Lib/test/test_capi.py

@@ -50,6 +50,8 @@ class CAPITest(unittest.TestCase):
                          b'Fatal Python error:'
                          b' PyThreadState_Get: no current thread')
 
+    def test_memoryview_from_NULL_pointer(self):
+        self.assertRaises(ValueError, _testcapi.make_memoryview_from_NULL_pointer)
 
 @unittest.skipUnless(threading, 'Threading required for this test.')
 class TestPendingCalls(unittest.TestCase):

Misc/NEWS

@@ -10,6 +10,9 @@ What's New in Python 3.3 Alpha 1?
 Core and Builtins
 -----------------
 
+- Issue #11286: Raise a ValueError from calling PyMemoryView_FromBuffer with
+  a buffer struct having a NULL data pointer.
+
 - Issue #11272: On Windows, input() strips '\r' (and not only '\n'), and
   sys.stdin uses universal newline (replace '\r\n' by '\n').
 

Modules/_testcapimodule.c

@@ -2231,6 +2231,15 @@ make_exception_with_doc(PyObject *self, PyObject *args, PyObject *kwargs)
     return PyErr_NewExceptionWithDoc(name, doc, base, dict);
 }
 
+static PyObject *
+make_memoryview_from_NULL_pointer(PyObject *self)
+{
+    Py_buffer info;
+    if (PyBuffer_FillInfo(&info, NULL, NULL, 1, 1, PyBUF_FULL_RO) < 0)
+        return NULL;
+    return PyMemoryView_FromBuffer(&info);
+}
+
 /* Test that the fatal error from not having a current thread doesn't
    cause an infinite loop.  Run via Lib/test/test_capi.py */
 static PyObject *
@@ -2326,6 +2335,8 @@ static PyMethodDef TestMethods[] = {
     {"code_newempty",           code_newempty,                   METH_VARARGS},
     {"make_exception_with_doc", (PyCFunction)make_exception_with_doc,
      METH_VARARGS | METH_KEYWORDS},
+    {"make_memoryview_from_NULL_pointer", (PyCFunction)make_memoryview_from_NULL_pointer,
+     METH_NOARGS},
     {"crash_no_current_thread", (PyCFunction)crash_no_current_thread, METH_NOARGS},
     {NULL, NULL} /* sentinel */
 };

Objects/memoryobject.c

@@ -75,6 +75,11 @@ PyMemoryView_FromBuffer(Py_buffer *info)
 {
     PyMemoryViewObject *mview;
 
+    if (info->buf == NULL) {
+        PyErr_SetString(PyExc_ValueError,
+            "cannot make memory view from a buffer with a NULL data pointer");
+        return NULL;
+    }
     mview = (PyMemoryViewObject *)
         PyObject_GC_New(PyMemoryViewObject, &PyMemoryView_Type);
     if (mview == NULL)