Undefined behavior in TlsSocket::Writev()

2685 E0510 00:47:17.810153   656 fault_injection.cc:54] Injecting fault: FLAGS_fault_crash_before_write_log_segment_header (process will exit)
2686 W0510 00:47:17.821826   451 connection.cc:462] client connection to 127.121.138.0:50064 recv error: Network error: failed to read from TLS socket: Connection reset by peer (error 104)
2687 ../../src/kudu/security/tls_socket.cc:80:19: runtime error: signed integer overflow: 2018308256 + 2018308256 cannot be represented in type 'int'
2688 W0510 00:47:17.821890   460 connection.cc:462] server connection from 127.121.138.0:36990 recv error: Network error: failed to read from TLS socket: Connection reset by peer (error 104)
2689 W0510 00:47:17.822394   460 connection.cc:462] client connection to 127.121.138.0:50064 recv error: Network error: failed to read from TLS socket: Connection reset by peer (error 104)
2690 SUMMARY: AddressSanitizer: undefined-behavior ../../src/kudu/security/tls_socket.cc:80:19 in

 69 Status TlsSocket::Writev(const struct ::iovec *iov, int iov_len, int32_t *nwritten) {
 70   SCOPED_OPENSSL_NO_PENDING_ERRORS;
 71   CHECK(ssl_);
 72   int32_t total_written = 0;
 73   // Allows packets to be aggresively be accumulated before sending.
 74   RETURN_NOT_OK(SetTcpCork(1));
 75   Status write_status = Status::OK();
 76   for (int i = 0; i < iov_len; ++i) {
 77     int32_t frame_size = iov[i].iov_len;
 78     // Don't return before unsetting TCP_CORK.
 79     write_status = Write(static_cast<uint8_t*>(iov[i].iov_base), frame_size, nwritten);
 80     total_written += *nwritten;
 81     if (*nwritten < frame_size) break;
 82   }
 83   RETURN_NOT_OK(SetTcpCork(0));
 84   *nwritten = total_written;
 85   return write_status;
 86 }