pathmtu/pathmtu.c: Check against UDP header length, not pointer size.

diff --git a/pathmtu/pathmtu.c b/pathmtu/pathmtu.c
index 5570278..4e8f568 100644 (file)
--- a/pathmtu/pathmtu.c
+++ b/pathmtu/pathmtu.c
@@ -616,7 +616,7 @@ static int raw_selproc(void *stv, fd_set *fd_in, struct probestate *ps)
     n -= sizeof(*ip);
 
     udp = (struct udphdr *)(ip + 1);
-    if (n < sizeof(udp) || udp->uh_sport != st->me.sin.sin_port ||
+    if (n < sizeof(*udp) || udp->uh_sport != st->me.sin.sin_port ||
        udp->uh_dport != st->a.sin.sin_port)
       goto skip_icmp;
     n -= sizeof(*udp);