SSL: fixed $ssl_session_id possible segfault after 97e3769637a7.
Even during execution of a request it is possible that there will be no session available, notably in case of renegotiation. As a result logging of $ssl_session_id in some cases caused NULL pointer dereference after revision 97e3769637a7 (1.5.9). The check added returns an empty string if there is no session available.
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@ -2233,6 +2233,10 @@ ngx_ssl_get_session_id(ngx_connection_t *c, ngx_pool_t *pool, ngx_str_t *s)
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SSL_SESSION *sess;
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sess = SSL_get0_session(c->ssl->connection);
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if (sess == NULL) {
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s->len = 0;
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return NGX_OK;
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}
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buf = sess->session_id;
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len = sess->session_id_length;
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