Fix race condition due to mutated _getDBs/_putDBs

ethereumjs · Dec 26, 2017 · ffa0c17 · ffa0c17
1 parent d3baf12
commit ffa0c17
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/checkpoint-interface.js b/checkpoint-interface.js
@@ -93,7 +93,7 @@ function _enterCpMode () {
   this._scratch = levelup('', {
     db: memdown
   })
-  this._getDBs.unshift(this._scratch)
+  this._getDBs = [this._scratch].concat(this._getDBs)
   this.__putDBs = this._putDBs
   this._putDBs = [this._scratch]
   this._putRaw = this.putRaw
@@ -105,7 +105,7 @@ function _exitCpMode (commitState, cb) {
   var self = this
   var scratch = this._scratch
   this._scratch = null
-  this._getDBs.shift()
+  this._getDBs = this._getDBs.slice(1)
   this._putDBs = this.__putDBs
   this.putRaw = this._putRaw