From 7eaef48f9efe2128ceb9e608f1c9c3d1bc6b886f Mon Sep 17 00:00:00 2001
From: Matt Joiner <anacrolix@gmail.com>
Date: Sun, 14 Sep 2014 04:07:05 +1000
Subject: [PATCH] Fix crash when piece hash completes for dropped torrent

---
 client.go | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/client.go b/client.go
index 61556967..115a9904 100644
--- a/client.go
+++ b/client.go
@@ -1502,12 +1502,12 @@ func (me *Client) pieceHashed(t *torrent, piece pp.Integer, correct bool) {
 
 func (cl *Client) verifyPiece(t *torrent, index pp.Integer) {
 	cl.mu.Lock()
+	defer cl.mu.Unlock()
 	p := t.Pieces[index]
 	for p.Hashing {
 		cl.event.Wait()
 	}
 	if t.isClosed() {
-		cl.mu.Unlock()
 		return
 	}
 	p.Hashing = true
@@ -1515,9 +1515,13 @@ func (cl *Client) verifyPiece(t *torrent, index pp.Integer) {
 	cl.mu.Unlock()
 	sum := t.HashPiece(index)
 	cl.mu.Lock()
+	select {
+	case <-t.closing:
+		return
+	default:
+	}
 	p.Hashing = false
 	cl.pieceHashed(t, index, sum == p.Hash)
-	cl.mu.Unlock()
 }
 
 func (me *Client) Torrents() (ret []*torrent) {
-- 
2.48.1