From c1954838b6fff4a0375f68483e283ab10e0a42bb Mon Sep 17 00:00:00 2001
From: Jonathan Hui <jonhui@nestlabs.com>
Date: Tue, 29 May 2018 09:45:44 -0700
Subject: [PATCH] [router-table] validate num routers when processing Route TLV
 (#2744)

Credit to OSS-Fuzz.
---
 src/core/thread/router_table.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/core/thread/router_table.cpp b/src/core/thread/router_table.cpp
index b9bbc1386..2eb60eba7 100644
--- a/src/core/thread/router_table.cpp
+++ b/src/core/thread/router_table.cpp
@@ -115,7 +115,7 @@ void RouterTable::UpdateAllocation(void)
     // build index map
     for (uint8_t i = 0; i <= Mle::kMaxRouterId; i++)
     {
-        if (IsAllocated(i))
+        if (IsAllocated(i) && mActiveRouterCount < Mle::kMaxRouters)
         {
             indexMap[i] = mActiveRouterCount++;
         }