Allow program accounts to be passed as program and parameter (#8907)

programs/bpf_loader/src/lib.rs

@@ -158,6 +158,14 @@ pub fn process_instruction(
     if is_executable(keyed_accounts)? {
         let mut keyed_accounts_iter = keyed_accounts.iter();
         let program = next_keyed_account(&mut keyed_accounts_iter)?;
+
+        let parameter_accounts = keyed_accounts_iter.as_slice();
+        let parameter_bytes = serialize_parameters(
+            program.unsigned_key(),
+            parameter_accounts,
+            &instruction_data,
+        )?;
+        {
             let program_account = program.try_account_ref_mut()?;
             let (mut vm, heap_region) = match create_vm(&program_account.data) {
                 Ok(info) => info,
@@ -166,12 +174,6 @@ pub fn process_instruction(
                     return Err(BPFLoaderError::VirtualMachineCreationFailed.into());
                 }
             };
-        let parameter_accounts = keyed_accounts_iter.as_slice();
-        let parameter_bytes = serialize_parameters(
-            program.unsigned_key(),
-            parameter_accounts,
-            &instruction_data,
-        )?;
 
             info!("Call BPF program");
             match vm.execute_program(parameter_bytes.as_slice(), &[], &[heap_region]) {
@@ -187,6 +189,7 @@ pub fn process_instruction(
                     return Err(BPFLoaderError::VirtualMachineFailedToRunProgram.into());
                 }
             }
+        }
         deserialize_parameters(parameter_accounts, &parameter_bytes)?;
         info!("BPF program success");
     } else if !keyed_accounts.is_empty() {