From d3a429b1eaa7269f55de2127116cb68a6661b086 Mon Sep 17 00:00:00 2001
From: Simon Lin <simonlin@google.com>
Date: Wed, 8 Jul 2020 02:11:17 +0800
Subject: [PATCH] [mle] fix invalid router after ProcessRouteTlv (#5200)

We always need to update existing router references after calling
ProcessRouteTlv.
---
 src/core/thread/mle_router.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/core/thread/mle_router.cpp b/src/core/thread/mle_router.cpp
index 4df5a0846..4e70eb23b 100644
--- a/src/core/thread/mle_router.cpp
+++ b/src/core/thread/mle_router.cpp
@@ -972,6 +972,9 @@ otError MleRouter::HandleLinkAccept(const Message &         aMessage,
             VerifyOrExit(route.IsValid(), error = OT_ERROR_PARSE);
             SuccessOrExit(error = ProcessRouteTlv(route));
             UpdateRoutes(route, routerId);
+            // need to update router after ProcessRouteTlv
+            router = mRouterTable.GetRouter(routerId);
+            OT_ASSERT(router != nullptr);
         }
 
         // update routing table