[3.12] gh-126341: add release check to __iter__ method of `memoryvi…

…ew` (GH-126759) (#126779)

gh-126341: add release check to `__iter__` method of `memoryview` (GH-126759)
(cherry picked from commit a12690e)

Co-authored-by: Ritvik Pasham <ritvikpasham@gmail.com>
Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>
Co-authored-by: Peter Bierma <zintensitydev@gmail.com>
Co-authored-by: Victor Stinner <vstinner@python.org>
Co-authored-by: sobolevn <mail@sobolevn.me>

Lib/test/test_buffer.py

@@ -3906,6 +3906,8 @@ def test_memoryview_check_released(self):
         self.assertRaises(ValueError, memoryview, m)
         # memoryview.cast()
         self.assertRaises(ValueError, m.cast, 'c')
+        # memoryview.__iter__()
+        self.assertRaises(ValueError, m.__iter__)
         # getbuffer()
         self.assertRaises(ValueError, ndarray, m)
         # memoryview.tolist()

Misc/NEWS.d/next/Core_and_Builtins/2024-11-12-19-24-00.gh-issue-126341.5SdAe1.rst

@@ -0,0 +1 @@
+Now :exc:`ValueError` is raised instead of :exc:`SystemError` when trying to iterate over a released :class:`memoryview` object.

Objects/memoryobject.c

@@ -3322,6 +3322,7 @@ memory_iter(PyObject *seq)
         PyErr_BadInternalCall();
         return NULL;
     }
+    CHECK_RELEASED(seq);
     PyMemoryViewObject *obj = (PyMemoryViewObject *)seq;
     int ndims = obj->view.ndim;
     if (ndims == 0) {