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contracts/chequebook/contract: fix possible reentrancy bug in chequebook.sol

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This commit is contained in:
Daniel A. Nagy
2016-08-30 15:53:14 +02:00
parent 3e7b4ae0c3
commit 7b884e0075
5 changed files with 11 additions and 39 deletions
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1
build/update-license.go
View File

@@ -51,6 +51,7 @@ var (
"crypto/secp256k1/curve.go",
"trie/arc.go",
// don't license generated files
"contracts/chequebook/contract/",
"contracts/ens/contract/",
}

19
contracts/chequebook/contract/chequebook.go
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@@ -1,18 +1,5 @@
// Copyright 2016 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
// This file is an automatically generated Go binding. Do not modify as any
// change will likely be lost upon the next re-generation!
package contract
@@ -30,7 +17,7 @@ import (
const ChequebookABI = `[{"constant":false,"inputs":[],"name":"kill","outputs":[],"type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"sent","outputs":[{"name":"","type":"uint256"}],"type":"function"},{"constant":false,"inputs":[{"name":"beneficiary","type":"address"},{"name":"amount","type":"uint256"},{"name":"sig_v","type":"uint8"},{"name":"sig_r","type":"bytes32"},{"name":"sig_s","type":"bytes32"}],"name":"cash","outputs":[],"type":"function"},{"anonymous":false,"inputs":[{"indexed":false,"name":"deadbeat","type":"address"}],"name":"Overdraft","type":"event"}]`
// ChequebookBin is the compiled bytecode used for deploying new contracts.
const ChequebookBin = `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`
const ChequebookBin = `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`
// DeployChequebook deploys a new Ethereum contract, binding an instance of Chequebook to it.
func DeployChequebook(auth *bind.TransactOpts, backend bind.ContractBackend) (common.Address, *types.Transaction, *Chequebook, error) {

8
contracts/chequebook/contract/chequebook.sol
View File

@@ -28,9 +28,11 @@ contract chequebook is mortal {
// Attempt sending the difference between the cumulative amount on the cheque
// and the cumulative amount on the last cashed cheque to beneficiary.
if (amount - sent[beneficiary] >= this.balance) {
if (beneficiary.send(amount - sent[beneficiary])) {
// Upon success, update the cumulative amount.
sent[beneficiary] = amount;
// update the cumulative amount before sending
sent[beneficiary] = amount;
if (!beneficiary.send(amount - sent[beneficiary])) {
// Upon failure to execute send, revert everything
throw;
}
} else {
// Upon failure, punish owner for writing a bounced cheque.

18
contracts/chequebook/contract/code.go
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@@ -1,21 +1,5 @@
// Copyright 2016 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package contract
// ContractDeployedCode is used to detect suicides. This constant needs to be
// updated when the contract code is changed.
const ContractDeployedCode = "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"
const ContractDeployedCode = "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"

4
contracts/chequebook/gencode.go
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@@ -59,9 +59,7 @@ func main() {
}
// Write the output file.
content := fmt.Sprintf(`// TODO: insert license header
package contract
content := fmt.Sprintf(`package contract
// ContractDeployedCode is used to detect suicides. This constant needs to be
// updated when the contract code is changed.