Merge branch '3.13' into backport-15a9762-3.13

Author: kumaraditya303

Doc/library/ctypes.rst

@@ -1335,6 +1335,9 @@ On Linux, :func:`~ctypes.util.find_library` tries to run external programs
 (``/sbin/ldconfig``, ``gcc``, ``objdump`` and ``ld``) to find the library file.
 It returns the filename of the library file.
 
+Note that if the output of these programs does not correspond to the dynamic
+linker used by Python, the result of this function may be misleading.
+
 .. versionchanged:: 3.6
    On Linux, the value of the environment variable ``LD_LIBRARY_PATH`` is used
    when searching for libraries, if a library cannot be found by any other means.
@@ -2037,6 +2040,8 @@ Utility functions
 
    The exact functionality is system dependent.
 
+   See :ref:`ctypes-finding-shared-libraries` for complete documentation.
+
 
 .. function:: find_msvcrt()
    :module: ctypes.util

Lib/test/test_io.py

@@ -4160,6 +4160,22 @@ def write(self, data):
         self.assertEqual([b"abcdef", b"middle", b"g"*chunk_size],
                          buf._write_stack)
 
+    def test_issue142594(self):
+        wrapper = None
+        detached = False
+        class ReentrantRawIO(self.RawIOBase):
+            @property
+            def closed(self):
+                nonlocal detached
+                if wrapper is not None and not detached:
+                    detached = True
+                    wrapper.detach()
+                return False
+
+        raw = ReentrantRawIO()
+        wrapper = self.TextIOWrapper(raw)
+        wrapper.close()  # should not crash
+
 
 class PyTextIOWrapperTest(TextIOWrapperTest):
     io = pyio

Misc/NEWS.d/next/Library/2025-12-14-18-30-48.gh-issue-142594.belDmD.rst

@@ -0,0 +1,2 @@
+Fix crash in ``TextIOWrapper.close()`` when the underlying buffer's
+``closed`` property calls :meth:`~io.TextIOBase.detach`.

Modules/_io/textio.c

@@ -3133,6 +3133,9 @@ _io_TextIOWrapper_close_impl(textio *self)
     if (r > 0) {
         Py_RETURN_NONE; /* stream already closed */
     }
+    if (self->detached) {
+        Py_RETURN_NONE; /* gh-142594 null pointer issue */
+    }
     else {
         PyObject *exc = NULL;
         if (self->finalizing) {