Fix CVE-2021-33833 which is a stack buffer overflow in dnsproxy. Release notes: https://lore.kernel.org/connman/20210610113503.ob45lhssqy5hk4ki@beryllium.lan/ Signed-off-by: John Keeping <john@metanate.com> Signed-off-by: Peter Korsgaard <peter@korsgaard.com>