[3.11] gh-106242: Make ntpath.realpath errors consistent with abspath when there are embedded nulls (GH-108248)

gh-106242: Make ntpath.realpath errors consistent with abspath when there are embedded nulls (GH-108248)

---------

(cherry picked from commit de33b5c662ea8d35d81ed857c6a39e34ab94c510)

Co-authored-by: Steve Dower <steve.dower@python.org>
Co-authored-by: Gregory P. Smith <greg@krypto.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/Lib/test/test_ntpath.py b/Lib/test/test_ntpath.py
index 75e50d9..88660fc 100644
--- a/Lib/test/test_ntpath.py
+++ b/Lib/test/test_ntpath.py
@@ -332,6 +332,10 @@ class TestNtpath(NtpathTestCase):
             raise OSError("No free drive letters available")
         self.assertEqual(ntpath.realpath(d), d)
 
+        # gh-106242: Embedded nulls and non-strict fallback to abspath
+        self.assertEqual(ABSTFN + "\0spam",
+                         ntpath.realpath(os_helper.TESTFN + "\0spam", strict=False))
+
     @os_helper.skip_unless_symlink
     @unittest.skipUnless(HAVE_GETFINALPATHNAME, 'need _getfinalpathname')
     def test_realpath_strict(self):
@@ -342,6 +346,8 @@ class TestNtpath(NtpathTestCase):
         self.addCleanup(os_helper.unlink, ABSTFN)
         self.assertRaises(FileNotFoundError, ntpath.realpath, ABSTFN, strict=True)
         self.assertRaises(FileNotFoundError, ntpath.realpath, ABSTFN + "2", strict=True)
+        # gh-106242: Embedded nulls should raise OSError (not ValueError)
+        self.assertRaises(OSError, ntpath.realpath, ABSTFN + "\0spam", strict=True)
 
     @os_helper.skip_unless_symlink
     @unittest.skipUnless(HAVE_GETFINALPATHNAME, 'need _getfinalpathname')