Heran Yang
2aed6d9ad7
When IPv4 ACD is enabled for a DHCPv4 address, the address remains in the request queue until ACD succeeds. Hence, when ACD detects a conflict, the address may not be present in link->addresses yet. on_acd() currently looks up the address with address_get(), which only searches link->addresses. This makes the callback return early and prevents dhcp4_address_on_conflict() from sending DHCPDECLINE. Use address_get_harder(), which also looks up pending address requests. Fixes #39460
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