From: Dong-hee Na <donghee.na92@gmail.com>
Date: Mon, 4 May 2020 17:30:42 +0000 (+0900)
Subject: bpo-40489: Add test case for dict contain use after free (GH-19906)
X-Git-Tag: v3.9.0b1~185
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=785f5e6d674306052bf865677d885c30561985ae;p=thirdparty%2FPython%2Fcpython.git

bpo-40489: Add test case for dict contain use after free (GH-19906)
---

diff --git a/Lib/test/test_dict.py b/Lib/test/test_dict.py
index d5a3d9e89457..6b8596fff6a9 100644
--- a/Lib/test/test_dict.py
+++ b/Lib/test/test_dict.py
@@ -1324,6 +1324,19 @@ class DictTest(unittest.TestCase):
         d = {0: set()}
         (0, X()) in d.items()
 
+    def test_dict_contain_use_after_free(self):
+        # bpo-40489
+        class S(str):
+            def __eq__(self, other):
+                d.clear()
+                return NotImplemented
+
+            def __hash__(self):
+                return hash('test')
+
+        d = {S(): 'value'}
+        self.assertFalse('test' in d)
+
     def test_init_use_after_free(self):
         class X:
             def __hash__(self):