From 44becb8cba677cbfdbcf2f7652277e5e1efc4f20 Mon Sep 17 00:00:00 2001
From: devdanzin <74280297+devdanzin@users.noreply.github.com>
Date: Sat, 26 Oct 2024 22:23:53 -0300
Subject: [PATCH] gh-125666: Avoid PyREPL exiting when a null byte is in input
 (#125732)

---
 Lib/code.py                                              | 3 ++-
 Lib/test/test_pyrepl/test_interact.py                    | 9 +++++++++
 Lib/test/test_pyrepl/test_pyrepl.py                      | 5 +++++
 .../2024-10-19-16-06-52.gh-issue-125666.jGfdCP.rst       | 1 +
 4 files changed, 17 insertions(+), 1 deletion(-)
 create mode 100644 Misc/NEWS.d/next/Library/2024-10-19-16-06-52.gh-issue-125666.jGfdCP.rst

diff --git a/Lib/code.py b/Lib/code.py
index c7c59ee2021..1cc2ed8b1db 100644
--- a/Lib/code.py
+++ b/Lib/code.py
@@ -136,7 +136,8 @@ class InteractiveInterpreter:
         # Set the line of text that the exception refers to
         lines = source.splitlines()
         if (source and typ is SyntaxError
-                and not value.text and len(lines) >= value.lineno):
+                and not value.text and value.lineno is not None
+                and len(lines) >= value.lineno):
             value.text = lines[value.lineno - 1]
         sys.last_exc = sys.last_value = value
         if sys.excepthook is sys.__excepthook__:
diff --git a/Lib/test/test_pyrepl/test_interact.py b/Lib/test/test_pyrepl/test_interact.py
index 0c6df4e5dae..e0ee310e2c4 100644
--- a/Lib/test/test_pyrepl/test_interact.py
+++ b/Lib/test/test_pyrepl/test_interact.py
@@ -117,6 +117,15 @@ SyntaxError: duplicate argument 'x' in function definition"""
             console.runsource(source)
             mock_showsyntaxerror.assert_called_once()
 
+    def test_runsource_survives_null_bytes(self):
+        console = InteractiveColoredConsole()
+        source = "\x00\n"
+        f = io.StringIO()
+        with contextlib.redirect_stdout(f), contextlib.redirect_stderr(f):
+            result = console.runsource(source)
+        self.assertFalse(result)
+        self.assertIn("source code string cannot contain null bytes", f.getvalue())
+
     def test_no_active_future(self):
         console = InteractiveColoredConsole()
         source = dedent("""\
diff --git a/Lib/test/test_pyrepl/test_pyrepl.py b/Lib/test/test_pyrepl/test_pyrepl.py
index 1a76832386b..f29a7ffbd7c 100644
--- a/Lib/test/test_pyrepl/test_pyrepl.py
+++ b/Lib/test/test_pyrepl/test_pyrepl.py
@@ -1313,6 +1313,11 @@ class TestMain(ReplTestCase):
                         self.assertIn("in x3", output)
                         self.assertIn("in <module>", output)
 
+    def test_null_byte(self):
+        output, exit_code = self.run_repl("\x00\nexit()\n")
+        self.assertEqual(exit_code, 0)
+        self.assertNotIn("TypeError", output)
+
     def test_readline_history_file(self):
         # skip, if readline module is not available
         readline = import_module('readline')
diff --git a/Misc/NEWS.d/next/Library/2024-10-19-16-06-52.gh-issue-125666.jGfdCP.rst b/Misc/NEWS.d/next/Library/2024-10-19-16-06-52.gh-issue-125666.jGfdCP.rst
new file mode 100644
index 00000000000..3b4488815cc
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2024-10-19-16-06-52.gh-issue-125666.jGfdCP.rst
@@ -0,0 +1 @@
+Avoid the exiting the interpreter if a null byte is given as input in the new REPL.