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dnsmasq: Backport DHCPv6 server fix (CVE-2022-0934)

Andreas Gnau requested to merge agnau-sec-6.5.5 into release-6.5

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)

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