dns: check length field in tcp response message

[musl] / src / network / lookup_name.c

diff --git a/src/network/lookup_name.c b/src/network/lookup_name.c
index f268bcd..4281482 100644 (file)
--- a/src/network/lookup_name.c
+++ b/src/network/lookup_name.c
@@ -179,6 +179,7 @@ static int name_from_dns(struct address buf[static MAXADDRS], char canon[static
 
        for (i=nq-1; i>=0; i--) {
                ctx.rrtype = qtypes[i];
+               if (alens[i] > sizeof(abuf[i])) alens[i] = sizeof abuf[i];
                __dns_parse(abuf[i], alens[i], dns_parse_callback, &ctx);
        }