Another problem reported by Coverity.  Backport candidate.
diff --git a/Objects/cellobject.c b/Objects/cellobject.c
index da48dea..65a29aa 100644
--- a/Objects/cellobject.c
+++ b/Objects/cellobject.c
@@ -8,6 +8,8 @@
 	PyCellObject *op;
 
 	op = (PyCellObject *)PyObject_GC_New(PyCellObject, &PyCell_Type);
+	if (op == NULL)
+		return NULL;
 	op->ob_ref = obj;
 	Py_XINCREF(obj);