From 88305e7612fb7d58eac9611f5fbb0c27151b3a90 Mon Sep 17 00:00:00 2001
From: Fabian Reinartz <fab.reinartz@gmail.com>
Date: Wed, 11 Oct 2017 10:17:59 +0200
Subject: [PATCH] Access chunk time range while holding lock

---
 head.go | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/head.go b/head.go
index 8ba1a71bc..abe668248 100644
--- a/head.go
+++ b/head.go
@@ -756,10 +756,11 @@ func (h *headChunkReader) Chunk(ref uint64) (chunks.Chunk, error) {
 
 	s.Lock()
 	c := s.chunk(int(cid))
+	mint, maxt := c.minTime, c.maxTime
 	s.Unlock()
 
 	// Do not expose chunks that are outside of the specified range.
-	if c == nil || !intervalOverlap(c.minTime, c.maxTime, h.mint, h.maxt) {
+	if c == nil || !intervalOverlap(mint, maxt, h.mint, h.maxt) {
 		return nil, ErrNotFound
 	}
 	return &safeChunk{