From f74751654b266eab4636e3fab1c16272fba61cf8 Mon Sep 17 00:00:00 2001
From: WANG Chao <chao.wang@ucloud.cn>
Date: Thu, 8 Feb 2018 15:44:20 +0800
Subject: [PATCH] graphdriver: Fix RefCounter memory leak

Signed-off-by: WANG Chao <chao.wang@ucloud.cn>
Upstream-commit: 9015a05606a9bb80f0d8d2e3d43b0b682ca53db4
Component: engine
---
 components/engine/daemon/graphdriver/counter.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/components/engine/daemon/graphdriver/counter.go b/components/engine/daemon/graphdriver/counter.go
index 53123f52ce..2772bd247d 100644
--- a/components/engine/daemon/graphdriver/counter.go
+++ b/components/engine/daemon/graphdriver/counter.go
@@ -54,6 +54,9 @@ func (c *RefCounter) incdec(path string, infoOp func(minfo *minfo)) int {
 	}
 	infoOp(m)
 	count := m.count
+	if count <= 0 {
+		delete(c.counts, path)
+	}
 	c.mu.Unlock()
 	return count
 }