Issue #11286: Raise a ValueError from calling PyMemoryView_FromBuffer with
a buffer struct having a NULL data pointer.
diff --git a/Objects/memoryobject.c b/Objects/memoryobject.c
index 7782076..2e32b2a 100644
--- a/Objects/memoryobject.c
+++ b/Objects/memoryobject.c
@@ -75,6 +75,11 @@
 {
     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)