From d22e073d2b49313bbf42d40cbe74afa2b69385df Mon Sep 17 00:00:00 2001
From: Kumar Aditya <kumaraditya@python.org>
Date: Sun, 6 Jul 2025 20:48:11 +0530
Subject: [PATCH] gh-109700: fix memory error handling in `PyDict_SetDefault`
 (#136338)

---
 .../2025-07-06-14-53-19.gh-issue-109700.KVNQQi.rst               | 1 +
 Objects/dictobject.c                                             | 1 +
 2 files changed, 2 insertions(+)
 create mode 100644 Misc/NEWS.d/next/Core_and_Builtins/2025-07-06-14-53-19.gh-issue-109700.KVNQQi.rst

diff --git a/Misc/NEWS.d/next/Core_and_Builtins/2025-07-06-14-53-19.gh-issue-109700.KVNQQi.rst b/Misc/NEWS.d/next/Core_and_Builtins/2025-07-06-14-53-19.gh-issue-109700.KVNQQi.rst
new file mode 100644
index 00000000000..a37f4a51050
--- /dev/null
+++ b/Misc/NEWS.d/next/Core_and_Builtins/2025-07-06-14-53-19.gh-issue-109700.KVNQQi.rst
@@ -0,0 +1 @@
+Fix memory error handling in :c:func:`PyDict_SetDefault`.
diff --git a/Objects/dictobject.c b/Objects/dictobject.c
index 6b7b150f0e2..be62ae5eefd 100644
--- a/Objects/dictobject.c
+++ b/Objects/dictobject.c
@@ -4411,6 +4411,7 @@ dict_setdefault_ref_lock_held(PyObject *d, PyObject *key, PyObject *default_valu
             if (result) {
                 *result = NULL;
             }
+            return -1;
         }
 
         STORE_USED(mp, mp->ma_used + 1);