From 04f13fef8b9f837a27f80153b9ebbd6addd69eab Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C5=81ukasz=20Duda?= <lukasz.duda@nordicsemi.no>
Date: Thu, 13 Oct 2016 15:23:00 +0200
Subject: [PATCH] Trickle Timer: Allow other modules to set Imin equal to Imax
 (#802)

Currently, when TrickleTimer:Start method is called with same aIntervalMin
and aIntervalMax, the remainder used to calculate I is 0, which cause an
Arithmetic Error and crash of the program.
---
 src/core/common/trickle_timer.cpp | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/core/common/trickle_timer.cpp b/src/core/common/trickle_timer.cpp
index 577342cbb..2fbde46fd 100644
--- a/src/core/common/trickle_timer.cpp
+++ b/src/core/common/trickle_timer.cpp
@@ -71,7 +71,14 @@ void TrickleTimer::Start(uint32_t aIntervalMin, uint32_t aIntervalMax, Mode aMod
     mMode = aMode;
 
     // Initialize I to [Imin, Imax]
-    I = Imin + otPlatRandomGet() % (Imax - Imin);
+    if (Imin == Imax)
+    {
+        I = Imin;
+    }
+    else
+    {
+        I = Imin + otPlatRandomGet() % (Imax - Imin);
+    }
 
     // Start a new interval
     StartNewInterval();