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Fix overflow in srml-contract. (#1113)

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This commit is contained in:
Sergey Pepyakin
2018-11-14 18:20:42 +01:00
committed by Bastian Köcher
parent fa84cec382
commit 2a9f6bed10
1 changed files with 4 additions and 1 deletions
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substrate/srml/contract/src/gas.rs
+4 -1
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@@ -150,9 +150,12 @@ pub fn buy_gas<T: Trait>(
let cost = <T::Gas as As<T::Balance>>::as_(gas_limit.clone())
.checked_mul(&gas_price)
.ok_or("overflow multiplying gas limit by price")?;
if b < cost + <balances::Module<T>>::existential_deposit() {
let new_balance = b.checked_sub(&cost);
if new_balance < Some(<balances::Module<T>>::existential_deposit()) {
return Err("not enough funds for transaction fee");
}
<balances::Module<T>>::set_free_balance(transactor, b - cost);
<balances::Module<T>>::decrease_total_stake_by(cost);
Ok(GasMeter {