From 1e2e1b41f8cf0c51f53dd064a4caa75faee14065 Mon Sep 17 00:00:00 2001
From: ucwong <ucwong@126.com>
Date: Wed, 1 Apr 2020 22:12:01 +0800
Subject: [PATCH] cmd/devp2p, cmd/wnode, whisper: add missing calls to
 Timer.Stop (#20843)

---
 cmd/devp2p/crawl.go          | 1 +
 cmd/wnode/main.go            | 1 +
 whisper/whisperv6/whisper.go | 1 +
 3 files changed, 3 insertions(+)

diff --git a/cmd/devp2p/crawl.go b/cmd/devp2p/crawl.go
index 92aaad72a3..7fefbd7a1c 100644
--- a/cmd/devp2p/crawl.go
+++ b/cmd/devp2p/crawl.go
@@ -63,6 +63,7 @@ func (c *crawler) run(timeout time.Duration) nodeSet {
 		doneCh       = make(chan enode.Iterator, len(c.iters))
 		liveIters    = len(c.iters)
 	)
+	defer timeoutTimer.Stop()
 	for _, it := range c.iters {
 		go c.runIterator(doneCh, it)
 	}
diff --git a/cmd/wnode/main.go b/cmd/wnode/main.go
index 968f1fd49f..a94ed947d0 100644
--- a/cmd/wnode/main.go
+++ b/cmd/wnode/main.go
@@ -599,6 +599,7 @@ func messageLoop() {
 	}
 
 	ticker := time.NewTicker(time.Millisecond * 50)
+	defer ticker.Stop()
 
 	for {
 		select {
diff --git a/whisper/whisperv6/whisper.go b/whisper/whisperv6/whisper.go
index e9c872a990..377406b360 100644
--- a/whisper/whisperv6/whisper.go
+++ b/whisper/whisperv6/whisper.go
@@ -905,6 +905,7 @@ func (whisper *Whisper) update() {
 	defer whisper.wg.Done()
 	// Start a ticker to check for expirations
 	expire := time.NewTicker(expirationCycle)
+	defer expire.Stop()
 
 	// Repeat updates until termination is requested
 	for {