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Fixing order of if statements to avoid overflows. (#1384) 

* Removing old transactions

* Explanation comment [ci skip]
This commit is contained in:
Tomasz Drwięga 2016-06-22 11:15:22 +02:00 committed by Gav Wood
parent e7d96484a1
commit e2de1987c7
1 changed files with 8 additions and 7 deletions
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15
ethcore/src/miner/transaction_queue.rs
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@ -657,8 +657,14 @@ impl TransactionQueue {
.cloned()
.map_or(state_nonce, |n| n + U256::one());
// Check height
if nonce > next_nonce {
// The transaction might be old, let's check that.
// This has to be the first test, otherwise calculating
// nonce height would result in overflow.
if nonce < state_nonce {
// Droping transaction
trace!(target: "miner", "Dropping old transaction: {:?} (nonce: {} < {})", tx.hash(), nonce, next_nonce);
return Err(TransactionError::Old);
} else if nonce > next_nonce {
// We have a gap - put to future.
// Update nonces of transactions in future (remove old transactions)
self.update_future(&address, state_nonce);
@ -667,12 +673,7 @@ impl TransactionQueue {
// Return an error if this transaction is not imported because of limit.
try!(check_if_removed(&address, &nonce, self.future.enforce_limit(&mut self.by_hash)));
return Ok(TransactionImportResult::Future);
} else if nonce < state_nonce {
// Droping transaction
trace!(target: "miner", "Dropping old transaction: {:?} (nonce: {} < {})", tx.hash(), nonce, next_nonce);
return Err(TransactionError::Old);
}
try!(check_too_cheap(Self::replace_transaction(tx, state_nonce, &mut self.current, &mut self.by_hash)));
// Keep track of highest nonce stored in current
let new_max = self.last_nonces.get(&address).map_or(nonce, |n| cmp::max(nonce, *n));