Issue #25745: Fixed leaking a userptr in curses panel destructor.

Misc/NEWS

@@ -77,7 +77,7 @@ Core and Builtins
 Library
 -------
 
-- Issue #26881: modulefinder now works with bytecode with extended args.
+- Issue #25745: Fixed leaking a userptr in curses panel destructor.
 
 - Issue #17765: weakref.ref() no longer silently ignores keyword arguments.
   Patch by Georg Brandl.

Modules/_curses_panel.c

@@ -191,6 +191,11 @@ PyCursesPanel_New(PANEL *pan, PyCursesWindowObject *wo)
 static void
 PyCursesPanel_Dealloc(PyCursesPanelObject *po)
 {
+    PyObject *obj = (PyObject *) panel_userptr(po->pan);
+    if (obj) {
+        (void)set_panel_userptr(po->pan, NULL);
+        Py_DECREF(obj);
+    }
     (void)del_panel(po->pan);
     if (po->wo != NULL) {
         Py_DECREF(po->wo);