in performing dns lookups, check result from res_mkquery

don't send a query that may be malformed.

diff --git a/src/network/lookup_name.c b/src/network/lookup_name.c
index 86f90ac..d3d97b4 100644 (file)
--- a/src/network/lookup_name.c
+++ b/src/network/lookup_name.c
@@ -145,11 +145,15 @@ static int name_from_dns(struct address buf[static MAXADDRS], char canon[static
        if (family != AF_INET6) {
                qlens[nq] = __res_mkquery(0, name, 1, RR_A, 0, 0, 0,
                        qbuf[nq], sizeof *qbuf);
+               if (qlens[nq] == -1)
+                       return EAI_NONAME;
                nq++;
        }
        if (family != AF_INET) {
                qlens[nq] = __res_mkquery(0, name, 1, RR_AAAA, 0, 0, 0,
                        qbuf[nq], sizeof *qbuf);
+               if (qlens[nq] == -1)
+                       return EAI_NONAME;
                nq++;
        }