Nandakumar Raghavan
6d7cb9a6b8
When a DHCP client uses SendOption=82:string:..., option_append() calls the SD_DHCP_OPTION_RELAY_AGENT_INFORMATION case which was written for the server relay path. It casts optval to sd_dhcp_server* and calls strlen() on its members, but optval is actually raw binary data from the client, causing SIGSEGV. The same is applicable when option 43 and option 77 are passed to SendOption. Fix by checking optlen > 0 and appending the option as a plain TLV, skipping the server-specific relay agent logic.
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