Handle errors correctly in `_pystatvfs_fromstructstatvfs` in `posixmodule`

[sobolevn]

Bug report

Here the first possible error will be overwritten by the following ones:

cpython/Modules/posixmodule.c

Lines 12969 to 13014 in b4b4e76

	PyObject *v = PyStructSequence_New((PyTypeObject *)StatVFSResultType);
	if (v == NULL)
	return NULL;
	#if !defined(HAVE_LARGEFILE_SUPPORT)
	PyStructSequence_SET_ITEM(v, 0, PyLong_FromLong((long) st.f_bsize));
	PyStructSequence_SET_ITEM(v, 1, PyLong_FromLong((long) st.f_frsize));
	PyStructSequence_SET_ITEM(v, 2, PyLong_FromLong((long) st.f_blocks));
	PyStructSequence_SET_ITEM(v, 3, PyLong_FromLong((long) st.f_bfree));
	PyStructSequence_SET_ITEM(v, 4, PyLong_FromLong((long) st.f_bavail));
	PyStructSequence_SET_ITEM(v, 5, PyLong_FromLong((long) st.f_files));
	PyStructSequence_SET_ITEM(v, 6, PyLong_FromLong((long) st.f_ffree));
	PyStructSequence_SET_ITEM(v, 7, PyLong_FromLong((long) st.f_favail));
	PyStructSequence_SET_ITEM(v, 8, PyLong_FromLong((long) st.f_flag));
	PyStructSequence_SET_ITEM(v, 9, PyLong_FromLong((long) st.f_namemax));
	#else
	PyStructSequence_SET_ITEM(v, 0, PyLong_FromLong((long) st.f_bsize));
	PyStructSequence_SET_ITEM(v, 1, PyLong_FromLong((long) st.f_frsize));
	PyStructSequence_SET_ITEM(v, 2,
	PyLong_FromLongLong((long long) st.f_blocks));
	PyStructSequence_SET_ITEM(v, 3,
	PyLong_FromLongLong((long long) st.f_bfree));
	PyStructSequence_SET_ITEM(v, 4,
	PyLong_FromLongLong((long long) st.f_bavail));
	PyStructSequence_SET_ITEM(v, 5,
	PyLong_FromLongLong((long long) st.f_files));
	PyStructSequence_SET_ITEM(v, 6,
	PyLong_FromLongLong((long long) st.f_ffree));
	PyStructSequence_SET_ITEM(v, 7,
	PyLong_FromLongLong((long long) st.f_favail));
	PyStructSequence_SET_ITEM(v, 8, PyLong_FromLong((long) st.f_flag));
	PyStructSequence_SET_ITEM(v, 9, PyLong_FromLong((long) st.f_namemax));
	#endif
	/* The _ALL_SOURCE feature test macro defines f_fsid as a structure
	* (issue #32390). */
	#if defined(_AIX) && defined(_ALL_SOURCE)
	PyStructSequence_SET_ITEM(v, 10, PyLong_FromUnsignedLong(st.f_fsid.val[0]));
	#else
	PyStructSequence_SET_ITEM(v, 10, PyLong_FromUnsignedLong(st.f_fsid));
	#endif
	if (PyErr_Occurred()) {
	Py_DECREF(v);
	return NULL;
	}
	return v;

Linked PRs

• gh-116541: Handle errors correctly in _pystatvfs_fromstructstatvfs #116542
• [3.12] gh-116541: Handle errors correctly in _pystatvfs_fromstructstatvfs (GH-116542) #116643
• [3.11] gh-116541: Handle errors correctly in _pystatvfs_fromstructstatvfs (GH-116542) #116644