added test case for a DAO-ACK with no options
diff --git a/print-icmp6.c b/print-icmp6.c
index c4f9987..6047ab6 100644
--- a/print-icmp6.c
+++ b/print-icmp6.c
@@ -673,6 +673,8 @@
u_int length)
{
length -= sizeof(struct rpl_dio_genoption);
+ if(length == 0) return;
+
ND_TCHECK(opt->rpl_dio_len);
while((opt->rpl_dio_type == RPL_OPT_PAD0 &&
diff --git a/tests/26-senddaoack.pcap b/tests/26-senddaoack.pcap
new file mode 100644
index 0000000..fd397a4
--- /dev/null
+++ b/tests/26-senddaoack.pcap
Binary files differ
diff --git a/tests/26-senddaovv.out b/tests/26-senddaovv.out
new file mode 100644
index 0000000..258fa2a
--- /dev/null
+++ b/tests/26-senddaovv.out
@@ -0,0 +1 @@
+IP6 (hlim 64, next-header ICMPv6 (58) payload length: 24) fe80::216:3eff:fe11:3424 > ff02::1: [icmp6 sum ok] ICMP6, RPL, (CLR)Destination Advertisement Object Ack [dagid:thisismydicedag2,seq:11,instance:43,status:0] [|truncated]
diff --git a/tests/TESTLIST b/tests/TESTLIST
index 670ea8b..d5d4ef2 100644
--- a/tests/TESTLIST
+++ b/tests/TESTLIST
@@ -58,6 +58,7 @@
dio01 dio.pcap dio.out -t -v
dio02 19-pickdag.pcap 19-pickdag.out -t -v -v
dio03 19-pickdag.pcap 19-pickdagvvv.out -t -v -v -v
+daoack01 26-senddaoack.pcap 26-senddaovv.out -t -v -v -v
# IPNET encapsulated site
e1000g e1000g.pcap e1000g.out -t
