moar fixes much refleaks wow

Author: pablogsal

Python/bltinmodule.c

@@ -328,6 +328,7 @@ builtin___lazy_import___impl(PyObject *module, PyObject *name,
     if (PyModule_Check(builtins)) {
         PyObject *builtins_dict = Py_XNewRef(PyModule_GetDict(builtins));
         if (builtins_dict == NULL) {
+            Py_DECREF(builtins);
             PyErr_SetString(PyExc_AttributeError, "builtins module has no dict");
             return NULL;
         }

Python/ceval.c

@@ -3768,6 +3768,9 @@ _PyEval_LazyImportFrom(PyThreadState *tstate, PyObject *v, PyObject *name)
     if (d->lz_attr != NULL) {
         if (PyUnicode_Check(d->lz_attr)) {
             PyObject *from = PyUnicode_FromFormat("%U.%U", d->lz_from, d->lz_attr);
+            if (from == NULL) {
+                return NULL;
+            }
             ret = _PyLazyImport_New(d->lz_builtins, from, name);
             Py_DECREF(from);
             return ret;
@@ -3776,6 +3779,9 @@ _PyEval_LazyImportFrom(PyThreadState *tstate, PyObject *v, PyObject *name)
         Py_ssize_t dot = PyUnicode_FindChar(d->lz_from, '.', 0, PyUnicode_GET_LENGTH(d->lz_from), 1);
         if (dot >= 0) {
             PyObject *from = PyUnicode_Substring(d->lz_from, 0, dot);
+            if (from == NULL) {
+                return NULL;
+            }
             ret = _PyLazyImport_New(d->lz_builtins, from, name);
             Py_DECREF(from);
             return ret;

Python/import.c

@@ -4351,9 +4351,10 @@ _PyImport_LazyImportModuleLevelObject(PyThreadState *tstate,
     if (filter != NULL) {
         PyObject *modname;
         if (PyDict_GetItemRef(globals, &_Py_ID(__name__), &modname) < 0) {
+            Py_DECREF(abs_name);
             return NULL;
         } else if (modname == NULL) {
-            modname = Py_None;
+            modname = Py_NewRef(Py_None);
         }
         PyObject *args[] = {modname, name, fromlist};
         PyObject *res = PyObject_Vectorcall(
@@ -4363,12 +4364,17 @@ _PyImport_LazyImportModuleLevelObject(PyThreadState *tstate,
             NULL
         );
 
+        Py_DECREF(modname);
+
         if (res == NULL) {
             Py_DECREF(abs_name);
             return NULL;
         }
 
-        if (!PyObject_IsTrue(res)) {
+        int is_true = PyObject_IsTrue(res);
+        Py_DECREF(res);
+
+        if (!is_true) {
             Py_DECREF(abs_name);
             return PyImport_ImportModuleLevelObject(
                 name, globals, locals, fromlist, level
@@ -4612,6 +4618,7 @@ _PyImport_ClearCore(PyInterpreterState *interp)
     Py_CLEAR(interp->imports.lazy_modules);
     Py_CLEAR(interp->imports.lazy_modules_set);
     Py_CLEAR(interp->imports.lazy_importing_modules);
+    Py_CLEAR(interp->imports.lazy_imports_filter);
 }
 
 void