From f728837ee6b48a2413437f54057b4552b7e77494 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jano=C5=A1=20Gulja=C5=A1?= <janos@users.noreply.github.com>
Date: Wed, 16 Jan 2019 14:31:32 +0100
Subject: [PATCH] swarm/storage: fix mockNetFetcher data races (#18462)

fixes: ethersphere/go-ethereum#1117
---
 swarm/storage/netstore_test.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/swarm/storage/netstore_test.go b/swarm/storage/netstore_test.go
index 2ed3e0752..a6a9f551a 100644
--- a/swarm/storage/netstore_test.go
+++ b/swarm/storage/netstore_test.go
@@ -43,6 +43,7 @@ type mockNetFetcher struct {
 	quit            <-chan struct{}
 	ctx             context.Context
 	hopCounts       []uint8
+	mu              sync.Mutex
 }
 
 func (m *mockNetFetcher) Offer(ctx context.Context, source *enode.ID) {
@@ -51,6 +52,9 @@ func (m *mockNetFetcher) Offer(ctx context.Context, source *enode.ID) {
 }
 
 func (m *mockNetFetcher) Request(ctx context.Context, hopCount uint8) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+
 	m.requestCalled = true
 	var peers []Address
 	m.peers.Range(func(key interface{}, _ interface{}) bool {