check feed id after pyth pull atomic update

Author: crispheaney

programs/drift/src/instructions/pyth_pull_oracle.rs

@@ -182,6 +182,13 @@ pub fn handle_post_multi_pyth_pull_oracle_updates_atomic<'c: 'info, 'info>(
                 },
             )?;
 
+            let price_feed_account_data = account.try_borrow_data()?;
+            let price_feed_account = PriceUpdateV2::try_deserialize(&mut &price_feed_account_data[..])?;
+            validate!(
+                price_feed_account.price_message.feed_id == feed_id,
+                ErrorCode::OraclePriceFeedMessageMismatch
+            )?;
+
             msg!(
                 "Posting new update. current ts {} < next ts {}",
                 current_timestamp,