From b6a790412ccacd9b90486fdb86e29f2e49c8fa6c Mon Sep 17 00:00:00 2001
From: wangshuo <wangshuo@kylinos.cn>
Date: Fri, 25 Oct 2024 10:13:37 +0800
Subject: [PATCH 3/3] [3.7] gh-115133: Fix test_xml_etree error with expat
 versions that fix CVE-2023-52425

Feeding the parser by too small chunks defers parsing to prevent CVE-2023-52425.
According to the upstream solution, chunk_size=22 is the smallest value
that can pass the tests.

See https://github.com/python/cpython/issues/115133
---
 Lib/test/test_xml_etree.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Lib/test/test_xml_etree.py b/Lib/test/test_xml_etree.py
index 5ba0de8..7b225ad 100644
--- a/Lib/test/test_xml_etree.py
+++ b/Lib/test/test_xml_etree.py
@@ -1060,7 +1060,9 @@ class XMLPullParserTest(unittest.TestCase):
                          expected)
 
     def test_simple_xml(self):
-        for chunk_size in (None, 1, 5):
+        # Feeding the parser by too small chunks defers parsing to prevent CVE-2023-52425.
+        # See https://github.com/python/cpython/issues/115133
+        for chunk_size in (None, 22, 25):
             with self.subTest(chunk_size=chunk_size):
                 parser = ET.XMLPullParser()
                 self.assert_event_tags(parser, [])
-- 
2.33.0

