Issue #23576: Avoid stalling in SSL reads when EOF has been reached in the SSL layer but the underlying connection hasn't been closed.

Author: pitrou

Misc/NEWS

@@ -13,6 +13,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #23576: Avoid stalling in SSL reads when EOF has been reached in the
+  SSL layer but the underlying connection hasn't been closed.
+
 - Issue #23504: Added an __all__ to the types module.
 
 - Issue #20204: Added the __module__ attribute to _tkinter classes.

Modules/_ssl.c

@@ -1717,26 +1717,6 @@ static PyObject *PySSL_SSLread(PySSLSocket *self, PyObject *args)
     BIO_set_nbio(SSL_get_rbio(self->ssl), nonblocking);
     BIO_set_nbio(SSL_get_wbio(self->ssl), nonblocking);
 
-    /* first check if there are bytes ready to be read */
-    PySSL_BEGIN_ALLOW_THREADS
-    count = SSL_pending(self->ssl);
-    PySSL_END_ALLOW_THREADS
-
-    if (!count) {
-        sockstate = check_socket_and_wait_for_timeout(sock, 0);
-        if (sockstate == SOCKET_HAS_TIMED_OUT) {
-            PyErr_SetString(PySocketModule.timeout_error,
-                            "The read operation timed out");
-            goto error;
-        } else if (sockstate == SOCKET_TOO_LARGE_FOR_SELECT) {
-            PyErr_SetString(PySSLErrorObject,
-                            "Underlying socket too large for select().");
-            goto error;
-        } else if (sockstate == SOCKET_HAS_BEEN_CLOSED) {
-            count = 0;
-            goto done;
-        }
-    }
     do {
         PySSL_BEGIN_ALLOW_THREADS
         count = SSL_read(self->ssl, mem, len);