From 486f7b76738a4a3664332fe42ff0ccc1b6f05c92 Mon Sep 17 00:00:00 2001
From: Jack May <jack@solana.com>
Date: Wed, 23 Mar 2022 17:03:01 -0700
Subject: [PATCH] use array access function (#23895)

---
 runtime/src/accounts.rs | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/runtime/src/accounts.rs b/runtime/src/accounts.rs
index 6d934e3946..24dabe3ff6 100644
--- a/runtime/src/accounts.rs
+++ b/runtime/src/accounts.rs
@@ -416,7 +416,13 @@ impl Accounts {
         error_counters: &mut ErrorCounters,
     ) -> Result<Vec<usize>> {
         let mut account_indices = Vec::new();
-        let mut program_id = accounts[program_account_index].0;
+        let mut program_id = match accounts.get(program_account_index) {
+            Some(program_account) => program_account.0,
+            None => {
+                error_counters.account_not_found += 1;
+                return Err(TransactionError::ProgramAccountNotFound);
+            }
+        };
         let mut depth = 0;
         while !native_loader::check_id(&program_id) {
             if depth >= 5 {