From e299fa75ad53592c36305834ad928d84fa709074 Mon Sep 17 00:00:00 2001
From: meows <b5c6@protonmail.com>
Date: Fri, 2 Oct 2020 16:14:57 -0500
Subject: [PATCH] miner: exit loop when downloader Done or Failed

Following the logic of the comment at the method,
this fixes a regression introduced at 7cf56d6f064869cb62b1673f9ee437020c595391
, which would allow external parties to DoS with
blocks, preventing mining progress.

Signed-off-by: meows <b5c6@protonmail.com>
---
 miner/miner.go | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/miner/miner.go b/miner/miner.go
index 8cbd70b424..4f8f76d4f9 100644
--- a/miner/miner.go
+++ b/miner/miner.go
@@ -111,6 +111,8 @@ func (miner *Miner) update() {
 					miner.SetEtherbase(miner.coinbase)
 					miner.worker.start()
 				}
+				// stop immediately and ignore all further pending events
+				return
 			}
 		case addr := <-miner.startCh:
 			if canStart {