From d43d7a9b48fe98e13984063bd5cbc72754c19fad Mon Sep 17 00:00:00 2001
From: Jeroen Simonetti <jeroen@simonetti.nl>
Date: Thu, 4 Apr 2019 14:20:36 +0200
Subject: [PATCH] Fix invalid attribute length data crash

Found using fuzzing.
---
 link.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/link.go b/link.go
index 4844c35..46d20fa 100644
--- a/link.go
+++ b/link.go
@@ -301,6 +301,9 @@ func (a *LinkAttributes) UnmarshalBinary(b []byte) error {
 		case iflaQdisc:
 			a.QueueDisc = nlenc.String(attr.Data)
 		case iflaOperState:
+			if len(attr.Data) != 1 {
+				return errInvalidLinkMessageAttr
+			}
 			a.OperationalState = OperationalState(nlenc.Uint8(attr.Data))
 		case iflaStats:
 			a.Stats = &LinkStats{}