From 2ef1dc37f02b08536b677dd23ec51541a60effd7 Mon Sep 17 00:00:00 2001
From: Radislav Chugunov <52372310+chgnrdv@users.noreply.github.com>
Date: Sat, 8 Jul 2023 10:47:01 +0300
Subject: gh-106524: Fix a crash in _sre.template() (GH-106525)

Some items remained uninitialized if _sre.template() was called with invalid
indices. Then attempt to clear them in the destructor led to dereferencing
of uninitialized pointer.
---
 Lib/test/test_re.py | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'Lib/test')

diff --git a/Lib/test/test_re.py b/Lib/test/test_re.py
index e4d14356402..8f26d0aacf4 100644
--- a/Lib/test/test_re.py
+++ b/Lib/test/test_re.py
@@ -2418,6 +2418,16 @@ class ReTests(unittest.TestCase):
                 p.terminate()
                 p.join()
 
+    def test_sre_template_invalid_group_index(self):
+        # see gh-106524
+        import _sre
+        with self.assertRaises(TypeError) as cm:
+            _sre.template("", ["", -1, ""])
+        self.assertIn("invalid template", str(cm.exception))
+        with self.assertRaises(TypeError) as cm:
+            _sre.template("", ["", (), ""])
+        self.assertIn("an integer is required", str(cm.exception))
+
 
 def get_debug_out(pat):
     with captured_stdout() as out:
-- 
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