table: fix 2byte AS peer helper functions

If AS_PATH attribute doesn't exist, just return.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>

1 files changed, 8 insertions, 0 deletions

diff --git a/table/message.go b/table/message.go
index dac7c439..0cfa07e8 100644
--- a/table/message.go
+++ b/table/message.go
@@ -29,6 +29,10 @@ func UpdatePathAttrs2ByteAs(msg *bgp.BGPUpdate) error {
 		}
 	}
 
+	if asAttr == nil {
+		return nil
+	}
+
 	as4pathParam := make([]*bgp.As4PathParam, 0)
 	for i, param := range asAttr.Value {
 		asParam, y := param.(*bgp.As4PathParam)
@@ -74,6 +78,10 @@ func UpdatePathAttrs4ByteAs(msg *bgp.BGPUpdate) error {
 		}
 	}
 
+	if asAttr == nil {
+		return nil
+	}
+
 	AS := make([]uint32, 0)
 	if as4Attr != nil {
 		for _, p := range as4Attr.Value {