Jun 23, 2022 · Jun 23, 2022 · Jun 23, 2022
diff --git a/Lib/test/test_pdb.py b/Lib/test/test_pdb.py
    4
    """

 def test_pdb_issue_gh_91742():
    """See GH-91742

    >>> def test_function():
    ...    __author__ = "pi"
    ...    __version__ = "3.14"
    ...
    ...    def about():
    ...        '''About'''
    ...        print(f"Author: {__author__!r}",
    ...            f"Version: {__version__!r}",
    ...            sep=" ")
    ...
    ...    import pdb; pdb.Pdb(nosigint=True, readrc=False).set_trace()
    ...    about()


    >>> reset_Breakpoint()
    >>> with PdbTestInput([  # doctest: +NORMALIZE_WHITESPACE
    ...     'step',
    ...     'next',
    ...     'next',
    ...     'jump 5',
    ...     'continue'
    ... ]):
    ...     test_function()
    > <doctest test.test_pdb.test_pdb_issue_gh_91742[0]>(12)test_function()
    -> about()
    (Pdb) step
    --Call--
    > <doctest test.test_pdb.test_pdb_issue_gh_91742[0]>(5)about()
    -> def about():
    (Pdb) next
    > <doctest test.test_pdb.test_pdb_issue_gh_91742[0]>(7)about()
    -> print(f"Author: {__author__!r}",
    (Pdb) next
    > <doctest test.test_pdb.test_pdb_issue_gh_91742[0]>(8)about()
    -> f"Version: {__version__!r}",
    (Pdb) jump 5
    > <doctest test.test_pdb.test_pdb_issue_gh_91742[0]>(5)about()
    -> def about():
    (Pdb) continue
    Author: 'pi' Version: '3.14'
    """
 @support.requires_subprocess()
 class PdbTestCase(unittest.TestCase):
    def tearDown(self):
diff --git a/Misc/NEWS.d/next/Library/2022-06-23-13-12-05.gh-issue-91742.sNytVX.rst b/Misc/NEWS.d/next/Library/2022-06-23-13-12-05.gh-issue-91742.sNytVX.rst
 Fix :mod:`pdb` crash after jump caused by a null pointer dereference. Patch by Kumar Aditya.
diff --git a/Objects/frameobject.c b/Objects/frameobject.c
 frame_stack_pop(PyFrameObject *f)
 {
    PyObject *v = _PyFrame_StackPop(f->f_frame);
 Py_DECREF(v);
 Py_XDECREF(v);
 }

 static PyFrameState
Original file line number	Diff line number	Diff line change
Expand Up		@@ -1363,7 +1363,50 @@ def test_pdb_issue_43318():
		4
		"""

		def test_pdb_issue_gh_91742():
		"""See GH-91742

		>>> def test_function():
		... __author__ = "pi"
		... __version__ = "3.14"
		...
		... def about():
		... '''About'''
		... print(f"Author: {__author__!r}",
		... f"Version: {__version__!r}",
		... sep=" ")
		...
		... import pdb; pdb.Pdb(nosigint=True, readrc=False).set_trace()
		... about()


		>>> reset_Breakpoint()
		>>> with PdbTestInput([ # doctest: +NORMALIZE_WHITESPACE
		... 'step',
		... 'next',
		... 'next',
		... 'jump 5',
		... 'continue'
		... ]):
		... test_function()
		> <doctest test.test_pdb.test_pdb_issue_gh_91742[0]>(12)test_function()
		-> about()
		(Pdb) step
		--Call--
		> <doctest test.test_pdb.test_pdb_issue_gh_91742[0]>(5)about()
		-> def about():
		(Pdb) next
		> <doctest test.test_pdb.test_pdb_issue_gh_91742[0]>(7)about()
		-> print(f"Author: {__author__!r}",
		(Pdb) next
		> <doctest test.test_pdb.test_pdb_issue_gh_91742[0]>(8)about()
		-> f"Version: {__version__!r}",
		(Pdb) jump 5
		> <doctest test.test_pdb.test_pdb_issue_gh_91742[0]>(5)about()
		-> def about():
		(Pdb) continue
		Author: 'pi' Version: '3.14'
		"""
		@support.requires_subprocess()
		class PdbTestCase(unittest.TestCase):
		def tearDown(self):
Expand Down
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1 @@
		Fix :mod:`pdb` crash after jump caused by a null pointer dereference. Patch by Kumar Aditya.
Original file line number	Diff line number	Diff line change
Expand Up		@@ -418,7 +418,7 @@ static void
		frame_stack_pop(PyFrameObject *f)
		{
		PyObject *v = _PyFrame_StackPop(f->f_frame);
		Py_DECREF(v);
		Py_XDECREF(v);
		}

		static PyFrameState
Expand Down