[3.13] gh-151126: Fix crash on unset memory error in ctypes.get_errno (GH-151382) (#151400)

miss-islington · sobolevn · web-flow · commit 7c3f0bd9b0e5 · 2026-06-12T11:27:19.000Z
gh-151126: Fix crash on unset memory error in `ctypes.get_errno` (GH-151382) (cherry picked from commit 6b217ea) 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
@@ -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
@@ -181,8 +181,9 @@ _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);

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	+Fix crash on unset :exc:`MemoryError` on allocation failure in
	`2`	+:func:`ctypes.get_errno`.