[uclibc-ng-devel] [PATCH] inet: gethostid: only accept v4 addresses

getaddrinfo() returns addresses from, at least, ip(7) and ipv6(7), but _addr() always uses sin_addr from struct sockaddr_in; we're saved from wild unsoundness (or incompatibility) by virtue of struct sockaddr_in6 having an always-0 u32 sin6_flowinfo at the same offset, so we end up returning 0 anyway, but in a round-about and definitely unintended way Instead, limit the request to AF_INET, and fall through to the end early, returning the default id=0 --- diff -ur uClibc-ng-1.0.41.orig/libc/inet/hostid.c uClibc-ng-1.0.41/libc/inet/hostid.c --- uClibc-ng-1.0.41.orig/libc/inet/hostid.c 2022-05-20 17:07:47.000000000 +0200 +++ uClibc-ng-1.0.41/libc/inet/hostid.c 2022-06-01 19:09:21.971253011 +0200 @@ -61,8 +61,7 @@ * Mitch */ if (gethostname(host, HOST_NAME_MAX) >= 0 && *host) { - struct addrinfo hints, *results, *addr; - memset(&hints, 0, sizeof(struct addrinfo)); + struct addrinfo hints = {.ai_family = AF_INET}, *results, *addr; if (!getaddrinfo(host, NULL, &hints, &results)) { for (addr = results; addr; addr = results->ai_next) { /* Just so it doesn't look exactly like the