gh-146076: Fix crash when a ZoneInfo subclass is missing a `_weak_c…

…ache` (GH-146082) (cherry picked from commit 3b06d68) Co-authored-by: Stan Ulbrych <[email protected]>
python · serhiy-storchaka · Mar 18, 2026 · Mar 18, 2026 · Mar 18, 2026 · 31b2e5065e0ec4397087c7499af8ccaf45985b80
commit 31b2e5065e0ec4397087c7499af8ccaf45985b80
diff --git a/Lib/test/test_zoneinfo/test_zoneinfo.py b/Lib/test/test_zoneinfo/test_zoneinfo.py
@@ -1595,6 +1595,18 @@ class ZI(self.klass):
             "Unexpected instance of int in ZI weak cache for key 'America/Los_Angeles'"
         )
 
+    def test_deleted_weak_cache(self):
+        class ZI(self.klass):
+            pass
+        delattr(ZI, '_weak_cache')
+
+        # These should not segfault
+        with self.assertRaises(AttributeError):
+            ZI("UTC")
+
+        with self.assertRaises(AttributeError):
+            ZI.clear_cache()
+
     def test_inconsistent_weak_cache_setdefault(self):
         class Cache:
             def get(self, key, default=None):

diff --git a/Misc/NEWS.d/next/Library/2026-03-17-20-41-27.gh-issue-146076.yoBNnB.rst b/Misc/NEWS.d/next/Library/2026-03-17-20-41-27.gh-issue-146076.yoBNnB.rst
@@ -0,0 +1,2 @@
+:mod:`zoneinfo`: fix crashes when deleting ``_weak_cache`` from a
+:class:`zoneinfo.ZoneInfo` subclass.
diff --git a/Modules/_zoneinfo.c b/Modules/_zoneinfo.c
@@ -316,6 +316,9 @@ zoneinfo_ZoneInfo_impl(PyTypeObject *type, PyObject *key)
     }
 
     PyObject *weak_cache = get_weak_cache(state, type);
+    if (weak_cache == NULL) {
+        return NULL;
+    }
     instance = PyObject_CallMethod(weak_cache, "get", "O", key, Py_None);
     if (instance == NULL) {
         Py_DECREF(weak_cache);
@@ -499,6 +502,9 @@ zoneinfo_ZoneInfo_clear_cache_impl(PyTypeObject *type, PyTypeObject *cls,
 {
     zoneinfo_state *state = zoneinfo_get_state_by_cls(cls);
     PyObject *weak_cache = get_weak_cache(state, type);
+    if (weak_cache == NULL) {
+        return NULL;
+    }
 
     if (only_keys == NULL || only_keys == Py_None) {
         PyObject *rv = PyObject_CallMethod(weak_cache, "clear", NULL);
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,2 @@
		:mod:`zoneinfo`: fix crashes when deleting ``_weak_cache`` from a
		:class:`zoneinfo.ZoneInfo` subclass.