Sergey Bugaev
82d3957646
RFC 6762 defines the top bit in RRs to mean cache flush (section 10.2), and the top bit in questions to mean that a unicast reply is wanted (section 5.4). dns_packet_read_key() is used for parsing both questions and RRs. When called from dns_packet_extract_question(), the top bit being set should not result in the packet being rejected as invalid. Fixes https://github.com/systemd/systemd/issues/17973
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