From 6247fe8edf292f8d3101d09fbdee646081f68009 Mon Sep 17 00:00:00 2001
From: laizy <laizhichao@onchain.com>
Date: Thu, 24 May 2018 11:59:39 +0800
Subject: [PATCH] fix block hash race condition

---
 core/ledger/block.go | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/core/ledger/block.go b/core/ledger/block.go
index 34d0cb32..4ede4845 100644
--- a/core/ledger/block.go
+++ b/core/ledger/block.go
@@ -131,8 +131,8 @@ func (b *Block) GetPrograms() []*program.Program {
 
 func (b *Block) Hash() Uint256 {
 	if b.hash == nil {
-		b.hash = new(Uint256)
-		*b.hash = b.Blockdata.Hash()
+		hash = b.Blockdata.Hash()
+		b.hash = &hash
 	}
 	return *b.hash
 }