SSL memory bug?

[Fasih]

Hi

I was looking at ngx_event_openssl.c, when I saw this.

      if (SSL_CTX_set_ex_data(ssl->ctx, ngx_ssl_certificate_index, x509)
          == 0)
      {
          ngx_ssl_error(NGX_LOG_EMERG, ssl->log, 0,
                        "SSL_CTX_set_ex_data() failed");
          X509_free(x509);
          BIO_free(bio);
          return NGX_ERROR;
      }

      X509_free(x509);


We just free the memory that is then used in

ngx_ssl_session_id_context (introduced in 1.6.2). I havent tried to
repro the error, but looks like a bug to me. PFA a suggested patch.
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