Attempt to invoke a buffer before it is used in a deployment

runtime/src/bank/tests.rs

@@ -7238,6 +7238,28 @@ fn test_bpf_loader_upgradeable_deploy_with_max_len() {
         &bpf_loader_upgradeable::id(),
     );
 
+    // Test buffer invocation
+    bank.store_account(&buffer_address, &buffer_account);
+    let instruction = Instruction::new_with_bytes(buffer_address, &[], Vec::new());
+    let message = Message::new(&[instruction], Some(&mint_keypair.pubkey()));
+    let transaction = Transaction::new(&[&binding], message, bank.last_blockhash());
+    assert_eq!(
+        bank.process_transaction(&transaction),
+        Err(TransactionError::InstructionError(
+            0,
+            InstructionError::InvalidAccountData,
+        )),
+    );
+    {
+        let program_cache = bank.transaction_processor.program_cache.read().unwrap();
+        let slot_versions = program_cache.get_slot_versions_for_tests(&buffer_address);
+        assert_eq!(slot_versions.len(), 1);
+        assert!(matches!(
+            slot_versions[0].program,
+            LoadedProgramType::Closed,
+        ));
+    }
+
     // Test successful deploy
     let payer_base_balance = LAMPORTS_PER_SOL;
     let deploy_fees = {