Can't return NULL from a void function. If there is a memory error,

about the best we can do is call PyErr_WriteUnraisable and go on.
We won't be able to do the call below either, so verify delstr is valid.

diff --git a/Objects/classobject.c b/Objects/classobject.c
index 0e4356b4c8a7ebcd65f3bcc984a4bd348ff70c36..b79f06e9cbeac5311d56bda06b1a02174111791a 100644 (file)
--- a/Objects/classobject.c
+++ b/Objects/classobject.c
@@ -624,9 +624,9 @@ instance_dealloc(register PyInstanceObject *inst)
        if (delstr == NULL) {
                delstr = PyString_InternFromString("__del__");
                if (delstr == NULL)
-                       return NULL;
+                       PyErr_WriteUnraisable((PyObject*)inst);
        }
-       if ((del = instance_getattr2(inst, delstr)) != NULL) {
+       if (delstr && (del = instance_getattr2(inst, delstr)) != NULL) {
                PyObject *res = PyEval_CallObject(del, (PyObject *)NULL);
                if (res == NULL)
                        PyErr_WriteUnraisable(del);