Anton Tiurin
7bd9f0f805
`sd_dhcp_server_configure_pool()` calculated the maximum pool size before checking whether `PoolOffset=` was inside the subnet. Because the calculation used unsigned arithmetic, an offset beyond the broadcast address could wrap around to a large value and pass validation. For example, `PoolOffset=256` with a `/24` and `PoolSize=1` was accepted, allowing the DHCP server to offer an address outside its configured subnet. Reject offsets at or beyond the broadcast address before performing the subtraction, and calculate the remaining pool size directly as `broadcast_off - offset`.
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