diff -r 4aab4e0cd759 Modules/pyexpat.c
--- a/Modules/pyexpat.c	Sun Apr 19 21:13:00 2015 +0300
+++ b/Modules/pyexpat.c	Sun Apr 19 21:13:12 2015 +0200
@@ -1699,15 +1699,18 @@
     */
     PyModule_AddStringConstant(m, "native_encoding", "UTF-8");
 
-    sys_modules = PySys_GetObject("modules");
+    if ((sys_modules = PySys_GetObject("modules")) == NULL)
+        return NULL;
     d = PyModule_GetDict(m);
     errors_module = PyDict_GetItem(d, errmod_name);
     if (errors_module == NULL) {
         errors_module = PyModule_New(MODULE_NAME ".errors");
         if (errors_module != NULL) {
-            PyDict_SetItem(sys_modules, errmod_name, errors_module);
+            if (PyDict_SetItem(sys_modules, errmod_name, errors_module) != 0)
+                return NULL;
             /* gives away the reference to errors_module */
-            PyModule_AddObject(m, "errors", errors_module);
+            if (PyModule_AddObject(m, "errors", errors_module) != 0)
+                return NULL;
         }
     }
     Py_DECREF(errmod_name);
@@ -1715,9 +1718,10 @@
     if (model_module == NULL) {
         model_module = PyModule_New(MODULE_NAME ".model");
         if (model_module != NULL) {
-            PyDict_SetItem(sys_modules, modelmod_name, model_module);
+            if (PyDict_SetItem(sys_modules, modelmod_name, model_module) != 0)
+                return NULL;
             /* gives away the reference to model_module */
-            PyModule_AddObject(m, "model", model_module);
+            ifPyModule_AddObject(m, "model", model_module);
         }
     }
     Py_DECREF(modelmod_name);