bpo-30394: Fix a socket leak in smtplib.SMTP.__init__() (#1700) (#1790)

matrixise · zhangyangyu · commit c3454f0e79b3 · 2017-05-25T02:59:06.000+08:00
diff --git a/Lib/smtplib.py b/Lib/smtplib.py
@@ -250,6 +250,7 @@ def __init__(self, host='', port=0, local_hostname=None,
         if host:
             (code, msg) = self.connect(host, port)
             if code != 220:
+                self.close()
                 raise SMTPConnectError(code, msg)
         if local_hostname is not None:
             self.local_hostname = local_hostname
