diff --git a/Lib/test/test_io.py b/Lib/test/test_io.py
--- a/Lib/test/test_io.py
+++ b/Lib/test/test_io.py
@@ -2502,6 +2502,11 @@ class MiscIOTest(unittest.TestCase):
                 {"mode": "w+b", "buffering": 0},
             ]:
             f = self.open(support.TESTFN, **kwargs)
+            raw = f
+            if hasattr(raw, 'buffer'):
+                raw = raw.buffer
+            if hasattr(raw, 'raw'):
+                raw = raw.raw
             f.close()
             self.assertRaises(ValueError, f.flush)
             self.assertRaises(ValueError, f.fileno)
@@ -2512,6 +2517,7 @@ class MiscIOTest(unittest.TestCase):
             self.assertRaises(ValueError, f.read)
             if hasattr(f, "read1"):
                 self.assertRaises(ValueError, f.read1, 1024)
+            self.assertRaises(ValueError, raw.readall)
             if hasattr(f, "readinto"):
                 self.assertRaises(ValueError, f.readinto, bytearray(1024))
             self.assertRaises(ValueError, f.readline)
diff --git a/Modules/_io/fileio.c b/Modules/_io/fileio.c
--- a/Modules/_io/fileio.c
+++ b/Modules/_io/fileio.c
@@ -583,6 +583,8 @@ fileio_readall(fileio *self)
     Py_ssize_t total = 0;
     int n;
 
+    if (self->fd < 0)
+        return err_closed();
     if (!_PyVerify_fd(self->fd))
         return PyErr_SetFromErrno(PyExc_IOError);