https://github.com/python/cpython/commit/cfd7f94c12c7ee85d51838b306b8c30596094ebc
commit: cfd7f94c12c7ee85d51838b306b8c30596094ebc
branch: 3.13
author: Miss Islington (bot) <[email protected]>
committer: vstinner <[email protected]>
date: 2026-03-20T16:40:55Z
summary:

[3.13] gh-146092: Raise MemoryError on allocation failure in _zoneinfo 
(GH-146165) (#146224)

gh-146092: Raise MemoryError on allocation failure in _zoneinfo (GH-146165)
(cherry picked from commit 6450b1d142b6254d2e3b2eba47d69125ca79b3fe)

Co-authored-by: Victor Stinner <[email protected]>

files:
M Modules/_zoneinfo.c

diff --git a/Modules/_zoneinfo.c b/Modules/_zoneinfo.c
index b590df4d5540ac..2a4186bb12564d 100644
--- a/Modules/_zoneinfo.c
+++ b/Modules/_zoneinfo.c
@@ -267,6 +267,7 @@ zoneinfo_new_instance(zoneinfo_state *state, PyTypeObject 
*type, PyObject *key)
 
     goto cleanup;
 error:
+    assert(PyErr_Occurred());
     Py_CLEAR(self);
 cleanup:
     if (file_obj != NULL) {
@@ -452,6 +453,7 @@ zoneinfo_ZoneInfo_from_file_impl(PyTypeObject *type, 
PyTypeObject *cls,
     return obj_self;
 
 error:
+    assert(PyErr_Occurred());
     Py_XDECREF(file_repr);
     Py_XDECREF(self);
     return NULL;
@@ -1041,10 +1043,12 @@ load_data(zoneinfo_state *state, PyZoneInfo_ZoneInfo 
*self, PyObject *file_obj)
     self->trans_list_utc =
         PyMem_Malloc(self->num_transitions * sizeof(int64_t));
     if (self->trans_list_utc == NULL) {
+        PyErr_NoMemory();
         goto error;
     }
     trans_idx = PyMem_Malloc(self->num_transitions * sizeof(Py_ssize_t));
     if (trans_idx == NULL) {
+        PyErr_NoMemory();
         goto error;
     }
 
@@ -1084,6 +1088,7 @@ load_data(zoneinfo_state *state, PyZoneInfo_ZoneInfo 
*self, PyObject *file_obj)
     isdst = PyMem_Malloc(self->num_ttinfos * sizeof(unsigned char));
 
     if (utcoff == NULL || isdst == NULL) {
+        PyErr_NoMemory();
         goto error;
     }
     for (size_t i = 0; i < self->num_ttinfos; ++i) {
@@ -1113,6 +1118,7 @@ load_data(zoneinfo_state *state, PyZoneInfo_ZoneInfo 
*self, PyObject *file_obj)
 
     dstoff = PyMem_Calloc(self->num_ttinfos, sizeof(long));
     if (dstoff == NULL) {
+        PyErr_NoMemory();
         goto error;
     }
 
@@ -1129,6 +1135,7 @@ load_data(zoneinfo_state *state, PyZoneInfo_ZoneInfo 
*self, PyObject *file_obj)
     // Build _ttinfo objects from utcoff, dstoff and abbr
     self->_ttinfos = PyMem_Malloc(self->num_ttinfos * sizeof(_ttinfo));
     if (self->_ttinfos == NULL) {
+        PyErr_NoMemory();
         goto error;
     }
     for (size_t i = 0; i < self->num_ttinfos; ++i) {
@@ -1149,6 +1156,7 @@ load_data(zoneinfo_state *state, PyZoneInfo_ZoneInfo 
*self, PyObject *file_obj)
     self->trans_ttinfos =
         PyMem_Calloc(self->num_transitions, sizeof(_ttinfo *));
     if (self->trans_ttinfos == NULL) {
+        PyErr_NoMemory();
         goto error;
     }
     for (size_t i = 0; i < self->num_transitions; ++i) {
@@ -1667,9 +1675,11 @@ parse_tz_str(zoneinfo_state *state, PyObject 
*tz_str_obj, _tzrule *out)
         p++;
 
         if (parse_transition_rule(&p, transitions[i])) {
-            PyErr_Format(PyExc_ValueError,
-                         "Malformed transition rule in TZ string: %R",
-                         tz_str_obj);
+            if (!PyErr_ExceptionMatches(PyExc_MemoryError)) {
+                PyErr_Format(PyExc_ValueError,
+                             "Malformed transition rule in TZ string: %R",
+                             tz_str_obj);
+            }
             goto error;
         }
     }
@@ -1869,6 +1879,7 @@ parse_transition_rule(const char **p, TransitionRuleType 
**out)
 
         CalendarRule *rv = PyMem_Calloc(1, sizeof(CalendarRule));
         if (rv == NULL) {
+            PyErr_NoMemory();
             return -1;
         }
 
@@ -1900,6 +1911,7 @@ parse_transition_rule(const char **p, TransitionRuleType 
**out)
 
         DayRule *rv = PyMem_Calloc(1, sizeof(DayRule));
         if (rv == NULL) {
+            PyErr_NoMemory();
             return -1;
         }
 
@@ -2133,6 +2145,7 @@ ts_to_local(size_t *trans_idx, int64_t *trans_utc, long 
*utcoff,
     for (size_t i = 0; i < 2; ++i) {
         trans_local[i] = PyMem_Malloc(num_transitions * sizeof(int64_t));
         if (trans_local[i] == NULL) {
+            PyErr_NoMemory();
             return -1;
         }
 

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