From f49d8b7b1d33ddc0ef03d0dea822dec83fbb8722 Mon Sep 17 00:00:00 2001
From: Jonathan Hui <jonhui@google.com>
Date: Fri, 13 Dec 2019 17:20:01 -0800
Subject: [PATCH] [mle] set appropriate Response TLV length in
 SendChildUpdateResponse (#4400)

---
 src/core/thread/mle_router.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/core/thread/mle_router.cpp b/src/core/thread/mle_router.cpp
index 89a8b3e3d..c4dca1732 100644
--- a/src/core/thread/mle_router.cpp
+++ b/src/core/thread/mle_router.cpp
@@ -3065,7 +3065,7 @@ void MleRouter::SendChildUpdateResponse(Child *                 aChild,
             break;
 
         case Tlv::kResponse:
-            SuccessOrExit(error = AppendResponse(*message, aChallenge.GetChallenge(), aChallenge.GetLength()));
+            SuccessOrExit(error = AppendResponse(*message, aChallenge.GetChallenge(), aChallenge.GetChallengeLength()));
             break;
 
         case Tlv::kSourceAddress: