dnsmasq: Backport DHCPv6 server fix (CVE-2022-0934)
This backports a commit from upstream dnsmasq to fix CVE-2022-0934.
CVE-2022-0934 description: A single-byte, non-arbitrary write/use-after-free flaw was found in dnsmasq. This flaw allows an attacker who sends a crafted packet processed by dnsmasq, potentially causing a denial of service.
Signed-off-by: Hauke Mehrtens hauke@hauke-m.de (cherry picked from commit 002a99ec)