Please try the diff below. It fixes the "backwards memcpy" problem easily noticeable with psql -h ::1.
$OpenBSD$ --- src/backend/libpq/hba.c.orig Mon Feb 16 21:53:21 2015 +++ src/backend/libpq/hba.c Mon Feb 16 21:54:44 2015 @@ -700,8 +700,8 @@ check_ip(SockAddr *raddr, struct sockaddr * addr, stru struct sockaddr_storage addrcopy, maskcopy; - memcpy(&addrcopy, &addr, sizeof(addrcopy)); - memcpy(&maskcopy, &mask, sizeof(maskcopy)); + memcpy(&addrcopy, addr, addr->sa_len); + memcpy(&maskcopy, mask, mask->sa_len); pg_promote_v4_to_v6_addr(&addrcopy); pg_promote_v4_to_v6_mask(&maskcopy); -- jca | PGP : 0x1524E7EE / 5135 92C1 AD36 5293 2BDF DDCC 0DFA 74AE 1524 E7EE