After the uncommitted transactions in the redo log buffer of MySQL InnoDB are persisted to the redo log, what happens if the transaction rollback occurs? How does the redo log handle this transaction

As the title ：mysql innodb Of redo log buffer Middle not commit The transaction is persisted to redo log after , In case of business rollback What should I do? ？redo log How to handle this transaction operation ？ And after the transaction is rolled back buffer pool How to recover the dirty page data inside , Or not commit front , Not modify buffer pool The data in it , So there is no need to restore ？