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-rw-r--r--miner/miner.go6
1 files changed, 6 insertions, 0 deletions
diff --git a/miner/miner.go b/miner/miner.go
index 3f87e8151..c9427f302 100644
--- a/miner/miner.go
+++ b/miner/miner.go
@@ -39,6 +39,10 @@ func New(eth core.Backend, mux *event.TypeMux, pow pow.PoW) *Miner {
return miner
}
+// update keeps track of the downloader events. Please be aware that this is a one shot type of update loop.
+// It's entered once and as soon as `Done` or `Failed` has been broadcasted the events are unregistered and
+// the loop is exited. This to prevent a major security vuln where external parties can DOS you with blocks
+// and halt your mining operation for as long as the DOS continues.
func (self *Miner) update() {
events := self.mux.Subscribe(downloader.StartEvent{}, downloader.DoneEvent{}, downloader.FailedEvent{})
for ev := range events.Chan() {
@@ -59,6 +63,8 @@ func (self *Miner) update() {
self.Start(self.coinbase, self.threads)
}
}
+ // unsubscribe. we're only interested in this event once
+ events.Unsubscribe()
}
}