From 19858453d73bf6fb38eedac96e82a23f2d3632e5 Mon Sep 17 00:00:00 2001
From: nnao45 <n4sekai5y@gmail.com>
Date: Wed, 8 Nov 2017 00:06:00 +0900
Subject: packet/bgp: fix flowspec parser about cmd badly args

---
 packet/bgp/bgp.go | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'packet/bgp/bgp.go')

diff --git a/packet/bgp/bgp.go b/packet/bgp/bgp.go
index 380cbbb2..21dc892d 100644
--- a/packet/bgp/bgp.go
+++ b/packet/bgp/bgp.go
@@ -3014,6 +3014,10 @@ func parseDecValuesCmd(myCmd string, validationFunc func(int) error) ([][2]int,
 				return nil, err
 			}
 		case DECLogicOpNameMap[DEC_LOGIC_OP_AND], DECLogicOpNameMap[DEC_LOGIC_OP_OR]:
+			if index == 0 {
+				err := fmt.Errorf("Logic operator appears a first character")
+				return nil, err
+			}
 			bit := DECLogicOpValueMap[myCmdChar]
 			decOperatorsAndValues = append(decOperatorsAndValues, operatorValue)
 			if myCmdChar == DECLogicOpNameMap[DEC_LOGIC_OP_AND] {
-- 
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