bool smb1cli_conn_activate_signing(struct smbXcli_conn *conn,
				   const DATA_BLOB user_session_key,
				   const DATA_BLOB response)
{
	return smb_signing_activate(conn->smb1.signing,
				    user_session_key,
				    response);
}

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.