reject invalid address families in getaddrinfo

subsequent code assumes the address family requested is either
unspecified or one of IPv4/IPv6, and could malfunction if this
constraint is not met, so other address families should be explicitly
rejected.

diff --git a/src/network/getaddrinfo.c b/src/network/getaddrinfo.c
index e58db6c..5d45be7 100644 (file)
--- a/src/network/getaddrinfo.c
+++ b/src/network/getaddrinfo.c
@@ -62,6 +62,9 @@ int getaddrinfo(const char *restrict host, const char *restrict serv, const stru
        int result;
        int cnt;
 
+       if (family != AF_INET && family != AF_INET6 && family != AF_UNSPEC)
+               return EAI_FAMILY;
+
        if (host && strlen(host)>255) return EAI_NONAME;
        if (serv && strlen(serv)>32) return EAI_SERVICE;