Merge pull request #36256 from wcwxyz/fix-refcounter-memory-leak

graphdriver: Fix RefCounter memory leak
Upstream-commit: 733ed2ddd3c621dadafbb74feb7b80d20fd3fd6f
Component: engine

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
 }