From 366b94905869d680b3f1d4801fb497e78811e511 Mon Sep 17 00:00:00 2001
From: Irit Katriel <1055913+iritkatriel@users.noreply.github.com>
Date: Fri, 10 Feb 2023 16:49:29 +0000
Subject: [PATCH] gh-101517: make bdb avoid looking up in linecache with
 lineno=None (#101787)

---
 Lib/bdb.py                                                 | 7 ++++---
 Lib/test/test_bdb.py                                       | 6 ++++++
 .../Library/2023-02-10-16-02-29.gh-issue-101517.r7S2u8.rst | 1 +
 3 files changed, 11 insertions(+), 3 deletions(-)
 create mode 100644 Misc/NEWS.d/next/Library/2023-02-10-16-02-29.gh-issue-101517.r7S2u8.rst

diff --git a/Lib/bdb.py b/Lib/bdb.py
index 81fbb8514ac..7f9b09514ff 100644
--- a/Lib/bdb.py
+++ b/Lib/bdb.py
@@ -570,9 +570,10 @@ class Bdb:
             rv = frame.f_locals['__return__']
             s += '->'
             s += reprlib.repr(rv)
-        line = linecache.getline(filename, lineno, frame.f_globals)
-        if line:
-            s += lprefix + line.strip()
+        if lineno is not None:
+            line = linecache.getline(filename, lineno, frame.f_globals)
+            if line:
+                s += lprefix + line.strip()
         return s
 
     # The following methods can be called by clients to use
diff --git a/Lib/test/test_bdb.py b/Lib/test/test_bdb.py
index 87a5ac308a1..042c2daea7f 100644
--- a/Lib/test/test_bdb.py
+++ b/Lib/test/test_bdb.py
@@ -1203,5 +1203,11 @@ class IssuesTestCase(BaseTestCase):
                 tracer.runcall(tfunc_import)
 
 
+class TestRegressions(unittest.TestCase):
+    def test_format_stack_entry_no_lineno(self):
+        # See gh-101517
+        Bdb().format_stack_entry((sys._getframe(), None))
+
+
 if __name__ == "__main__":
     unittest.main()
diff --git a/Misc/NEWS.d/next/Library/2023-02-10-16-02-29.gh-issue-101517.r7S2u8.rst b/Misc/NEWS.d/next/Library/2023-02-10-16-02-29.gh-issue-101517.r7S2u8.rst
new file mode 100644
index 00000000000..a5f6bdfa5ac
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2023-02-10-16-02-29.gh-issue-101517.r7S2u8.rst
@@ -0,0 +1 @@
+Fixed bug where :mod:`bdb` looks up the source line with :mod:`linecache` with a ``lineno=None``, which causes it to fail with an unhandled exception.