From 592575ca7a6f3892eafb5fe305a15d3dfee61be8 Mon Sep 17 00:00:00 2001
From: "Miss Islington (bot)"
 <31488909+miss-islington@users.noreply.github.com>
Date: Sat, 27 Jun 2026 17:28:27 +0200
Subject: [PATCH] [3.15] gh-151126: Sets missing exceptions in `tkinter` and
 `socket` modules initializations (GH-152418) (#152420)

gh-151126: Sets missing exceptions in `tkinter` and `socket` modules initializations (GH-152418)
(cherry picked from commit a9fa8560143098168e0380386acbf4846c37472b)

Co-authored-by: sobolevn <mail@sobolevn.me>
---
 .../next/Library/2026-06-27-17-19-09.gh-issue-151126.huUyOM.rst | 2 ++
 Modules/_tkinter.c                                              | 2 +-
 Modules/socketmodule.c                                          | 1 +
 3 files changed, 4 insertions(+), 1 deletion(-)
 create mode 100644 Misc/NEWS.d/next/Library/2026-06-27-17-19-09.gh-issue-151126.huUyOM.rst

diff --git a/Misc/NEWS.d/next/Library/2026-06-27-17-19-09.gh-issue-151126.huUyOM.rst b/Misc/NEWS.d/next/Library/2026-06-27-17-19-09.gh-issue-151126.huUyOM.rst
new file mode 100644
index 00000000000..2e51fd45b59
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2026-06-27-17-19-09.gh-issue-151126.huUyOM.rst
@@ -0,0 +1,2 @@
+Fix two crashes in :mod:`tkinter` and :mod:`socket` modules initialization
+under a memory pressure. Sets missing :exc:`MemoryError`.
diff --git a/Modules/_tkinter.c b/Modules/_tkinter.c
index 137eba40a76..8fa58d07096 100644
--- a/Modules/_tkinter.c
+++ b/Modules/_tkinter.c
@@ -3574,7 +3574,7 @@ PyInit__tkinter(void)
 
     tcl_lock = PyThread_allocate_lock();
     if (tcl_lock == NULL)
-        return NULL;
+        return PyErr_NoMemory();
 
     m = PyModule_Create(&_tkintermodule);
     if (m == NULL)
diff --git a/Modules/socketmodule.c b/Modules/socketmodule.c
index c69a9cc0498..97abd064ffd 100644
--- a/Modules/socketmodule.c
+++ b/Modules/socketmodule.c
@@ -9288,6 +9288,7 @@ socket_exec(PyObject *m)
 #if defined(USE_GETHOSTBYNAME_LOCK)
     netdb_lock = PyThread_allocate_lock();
     if (netdb_lock == NULL) {
+        PyErr_NoMemory();
         goto error;
     }
 #endif