Avoid what coverity calls "downcasting" (CID #1542293) #5170
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packet->data is a uint8_t * formerly cast to dhcp_packet_t const * to be passed to fr_dhcpv4_packet_get_option(). dhcp_packet_t is more strictly aligned than uint8_t, so coverity considers this a "tainted_data_downcast" and infers that the pointed-at data is tainted. To avoid the issue, the talloc_memdup() result is assigned first to a dhcp_packet_t * to pass to fr_dhcpv4_packet_get_option(), and cast to (uint8_t *) to assign to packet->data.
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packet->data is a uint8_t * formerly cast to dhcp_packet_t const * to be passed to fr_dhcpv4_packet_get_option(). dhcp_packet_t is more strictly aligned than uint8_t, so coverity considers this a "tainted_data_downcast" and infers that the pointed-at data is tainted.
To avoid the issue, the talloc_memdup() result is assigned first to a dhcp_packet_t * to pass to fr_dhcpv4_packet_get_option(), and cast to (uint8_t *) to assign to packet->data.