[3.15] gh-149921: Fix reference leaks in _interpchannels and _interpqueues modules (GH-149922) (#149943)

gh-149921: Fix reference leaks in _interpchannels and _interpqueues modules (GH-149922)
(cherry picked from commit acefff9)

Co-authored-by: AN Long <aisk@users.noreply.github.com>

Author: miss-islington

Misc/NEWS.d/next/Library/2026-05-16-21-08-33.gh-issue-149921.I1yNML.rst

@@ -0,0 +1,2 @@
+Fix reference leaks in error paths of the :mod:`!_interpchannels` and
+:mod:`!_interpqueues` extension modules.

Modules/_interpchannelsmodule.c

@@ -2586,6 +2586,7 @@ static PyObject *
 _channelid_from_xid(_PyXIData_t *data)
 {
     struct _channelid_xid *xid = (struct _channelid_xid *)_PyXIData_DATA(data);
+    PyObject *cidobj = NULL;
 
     // It might not be imported yet, so we can't use _get_current_module().
     PyObject *mod = PyImport_ImportModule(MODULE_NAME_STR);
@@ -2595,11 +2596,10 @@ _channelid_from_xid(_PyXIData_t *data)
     assert(mod != Py_None);
     module_state *state = get_module_state(mod);
     if (state == NULL) {
-        return NULL;
+        goto done;
     }
 
     // Note that we do not preserve the "resolve" flag.
-    PyObject *cidobj = NULL;
     int err = newchannelid(state->ChannelIDType, xid->cid, xid->end,
                            _global_channels(), 0, 0,
                            (channelid **)&cidobj);

Modules/_interpqueuesmodule.c

@@ -1363,6 +1363,7 @@ _queueobj_from_xid(_PyXIData_t *data)
     if (mod == NULL) {
         mod = PyImport_ImportModule(MODULE_NAME_STR);
         if (mod == NULL) {
+            Py_DECREF(qidobj);
             return NULL;
         }
     }