From c4943f3cb092835f6673f99c60a4c9fbffd637f8 Mon Sep 17 00:00:00 2001
From: "Jeff Washington (jwash)"
 <75863576+jeffwashington@users.noreply.github.com>
Date: Fri, 30 Apr 2021 09:56:34 -0500
Subject: [PATCH] checked_sub_lamports (#16932)

---
 runtime/src/accounts.rs | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/runtime/src/accounts.rs b/runtime/src/accounts.rs
index bddcab37ae..72afd3a8f0 100644
--- a/runtime/src/accounts.rs
+++ b/runtime/src/accounts.rs
@@ -17,7 +17,7 @@ use dashmap::{
 use log::*;
 use rand::{thread_rng, Rng};
 use solana_sdk::{
-    account::{Account, AccountSharedData, ReadableAccount},
+    account::{Account, AccountSharedData, ReadableAccount, WritableAccount},
     account_utils::StateMut,
     bpf_loader_upgradeable::{self, UpgradeableLoaderState},
     clock::{Slot, INITIAL_RENT_EPOCH},
@@ -287,7 +287,9 @@ impl Accounts {
                         error_counters.insufficient_funds += 1;
                         Err(TransactionError::InsufficientFundsForFee)
                     } else {
-                        accounts[payer_index].lamports -= fee;
+                        accounts[payer_index]
+                            .checked_sub_lamports(fee)
+                            .map_err(|_| TransactionError::InsufficientFundsForFee)?;
 
                         let message = tx.message();
                         let loaders = message