Motivation:
CVE-2016-4970
OpenSslEngine.wrap calls SSL_write which may return SSL_ERROR_WANT_READ, and if in this condition there is nothing to read from the BIO the OpenSslEngine and SslHandler will enter an infinite loop.
Modifications:
- Use the error code provided by OpenSSL and go back to the EventLoop selector to detect if the socket is closed
Result:
OpenSslEngine correctly handles the return codes from OpenSSL and does not enter an infinite loop.
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