gh-126341: add release check to __iter__ method of memoryview (#126759)

Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>
Co-authored-by: Peter Bierma <[email protected]>
Co-authored-by: Victor Stinner <[email protected]>
Co-authored-by: sobolevn <[email protected]>

Author: 5 people

Lib/test/test_buffer.py

@@ -3910,6 +3910,8 @@ 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

@@ -3356,6 +3356,7 @@ memory_iter(PyObject *seq)
         PyErr_BadInternalCall();
         return NULL;
     }
+    CHECK_RELEASED(seq);
     PyMemoryViewObject *obj = (PyMemoryViewObject *)seq;
     int ndims = obj->view.ndim;
     if (ndims == 0) {