From: Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com>
Date: Fri, 12 Jun 2026 11:31:51 +0000 (+0200)
Subject: [3.15] gh-151126: Fix crash on unset memory error in `ctypes.get_errno` (GH-151382... 
X-Git-Url: http://git.ipfire.org/gitweb/?a=commitdiff_plain;h=3603bd318b93d1ee1c40f39b6f2db08190a9e34a;p=thirdparty%2FPython%2Fcpython.git

[3.15] gh-151126: Fix crash on unset memory error in `ctypes.get_errno` (GH-151382) (#151398)

gh-151126: Fix crash on unset memory error in `ctypes.get_errno` (GH-151382)
(cherry picked from commit 6b217ea90b9cd694fded6308bc796e324bbacd19)

Co-authored-by: sobolevn <mail@sobolevn.me>
---

diff --git a/Misc/NEWS.d/next/Library/2026-06-12-00-04-34.gh-issue-151126.aHaBYq.rst b/Misc/NEWS.d/next/Library/2026-06-12-00-04-34.gh-issue-151126.aHaBYq.rst
new file mode 100644
index 000000000000..20ef69d5de5a
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2026-06-12-00-04-34.gh-issue-151126.aHaBYq.rst
@@ -0,0 +1,2 @@
+Fix crash on unset :exc:`MemoryError` on allocation failure in
+:func:`ctypes.get_errno`.
diff --git a/Modules/_ctypes/callproc.c b/Modules/_ctypes/callproc.c
index e453cfeec9cc..ccc57e347b07 100644
--- a/Modules/_ctypes/callproc.c
+++ b/Modules/_ctypes/callproc.c
@@ -168,8 +168,9 @@ _ctypes_get_errobj(ctypes_state *st, int **pspace)
     }
     else {
         void *space = PyMem_Calloc(2, sizeof(int));
-        if (space == NULL)
-            return NULL;
+        if (space == NULL) {
+            return PyErr_NoMemory();
+        }
         errobj = PyCapsule_New(space, CTYPES_CAPSULE_NAME_PYMEM, pymem_destructor);
         if (errobj == NULL) {
             PyMem_Free(space);