@@ -1993,39 +1993,46 @@ whichmodule(PyObject *global, PyObject *dotted_path)
         i = 0;
         while (PyDict_Next(modules, &i, &module_name, &module)) {
             if (_checkmodule(module_name, module, global, dotted_path) == 0) {
+                Py_DECREF(modules);
                 return Py_NewRef(module_name);
             }
             if (PyErr_Occurred()) {
+                Py_DECREF(modules);
                 return NULL;
             }
         }
     }
     else {
         PyObject *iterator = PyObject_GetIter(modules);
         if (iterator == NULL) {
+            Py_DECREF(modules);
             return NULL;
         }
         while ((module_name = PyIter_Next(iterator))) {
             module = PyObject_GetItem(modules, module_name);
             if (module == NULL) {
                 Py_DECREF(module_name);
                 Py_DECREF(iterator);
+                Py_DECREF(modules);
                 return NULL;
             }
             if (_checkmodule(module_name, module, global, dotted_path) == 0) {
                 Py_DECREF(module);
                 Py_DECREF(iterator);
+                Py_DECREF(modules);
                 return module_name;
             }
             Py_DECREF(module);
             Py_DECREF(module_name);
             if (PyErr_Occurred()) {
                 Py_DECREF(iterator);
+                Py_DECREF(modules);
                 return NULL;
             }
         }
         Py_DECREF(iterator);
     }
+    Py_DECREF(modules);
 
     /* If no module is found, use __main__. */
     module_name = &_Py_ID(__main__);
Original file line number	Diff line number	Diff line change
`@@ -1993,39 +1993,46 @@ whichmodule(PyObject global, PyObject dotted_path)`
`1993`	`1993`	`i = 0;`
`1994`	`1994`	`while (PyDict_Next(modules, &i, &module_name, &module)) {`
`1995`	`1995`	`if (_checkmodule(module_name, module, global, dotted_path) == 0) {`
	`1996`	`+ Py_DECREF(modules);`
`1996`	`1997`	`return Py_NewRef(module_name);`
`1997`	`1998`	`}`
`1998`	`1999`	`if (PyErr_Occurred()) {`
	`2000`	`+ Py_DECREF(modules);`
`1999`	`2001`	`return NULL;`
`2000`	`2002`	`}`
`2001`	`2003`	`}`
`2002`	`2004`	`}`
`2003`	`2005`	`else {`
`2004`	`2006`	`PyObject *iterator = PyObject_GetIter(modules);`
`2005`	`2007`	`if (iterator == NULL) {`
	`2008`	`+ Py_DECREF(modules);`
`2006`	`2009`	`return NULL;`
`2007`	`2010`	`}`
`2008`	`2011`	`while ((module_name = PyIter_Next(iterator))) {`
`2009`	`2012`	`module = PyObject_GetItem(modules, module_name);`
`2010`	`2013`	`if (module == NULL) {`
`2011`	`2014`	`Py_DECREF(module_name);`
`2012`	`2015`	`Py_DECREF(iterator);`
	`2016`	`+ Py_DECREF(modules);`
`2013`	`2017`	`return NULL;`
`2014`	`2018`	`}`
`2015`	`2019`	`if (_checkmodule(module_name, module, global, dotted_path) == 0) {`
`2016`	`2020`	`Py_DECREF(module);`
`2017`	`2021`	`Py_DECREF(iterator);`
	`2022`	`+ Py_DECREF(modules);`
`2018`	`2023`	`return module_name;`
`2019`	`2024`	`}`
`2020`	`2025`	`Py_DECREF(module);`
`2021`	`2026`	`Py_DECREF(module_name);`
`2022`	`2027`	`if (PyErr_Occurred()) {`
`2023`	`2028`	`Py_DECREF(iterator);`
	`2029`	`+ Py_DECREF(modules);`
`2024`	`2030`	`return NULL;`
`2025`	`2031`	`}`
`2026`	`2032`	`}`
`2027`	`2033`	`Py_DECREF(iterator);`
`2028`	`2034`	`}`
	`2035`	`+ Py_DECREF(modules);`
`2029`	`2036`
`2030`	`2037`	`/* If no module is found, use __main__. */`
`2031`	`2038`	`module_name = &_Py_ID(__main__);`