Issue #15261: Stop os.stat(fd) crashing on Windows when fd not open.

2 files changed, 23 insertions, 0 deletions

diff --git a/Lib/test/test_genericpath.py b/Lib/test/test_genericpath.py
index ebb8396..fc3d44c 100644
--- a/Lib/test/test_genericpath.py
+++ b/Lib/test/test_genericpath.py
@@ -146,6 +146,16 @@ class GenericTest(unittest.TestCase):
                 f.close()
             support.unlink(support.TESTFN)
 
+    @unittest.skipUnless(hasattr(os, "pipe"), "requires os.pipe()")
+    def test_exists_fd(self):
+        r, w = os.pipe()
+        try:
+            self.assertTrue(self.pathmodule.exists(r))
+        finally:
+            os.close(r)
+            os.close(w)
+        self.assertFalse(self.pathmodule.exists(r))
+
     def test_isdir(self):
         self.assertIs(self.pathmodule.isdir(support.TESTFN), False)
         f = open(support.TESTFN, "wb")
diff --git a/Lib/test/test_os.py b/Lib/test/test_os.py
index 57de993..7c73f1e 100644
--- a/Lib/test/test_os.py
+++ b/Lib/test/test_os.py
@@ -473,6 +473,19 @@ class StatAttributeTests(unittest.TestCase):
                     return
                 self.fail("Could not stat pagefile.sys")
 
+        @unittest.skipUnless(hasattr(os, "pipe"), "requires os.pipe()")
+        def test_15261(self):
+            # Verify that stat'ing a closed fd does not cause crash
+            r, w = os.pipe()
+            try:
+                os.stat(r)          # should not raise error
+            finally:
+                os.close(r)
+                os.close(w)
+            with self.assertRaises(OSError) as ctx:
+                os.stat(r)
+            self.assertEqual(ctx.exception.errno, errno.EBADF)
+
 from test import mapping_tests
 
 class EnvironTests(mapping_tests.BasicTestMappingProtocol):