Merge tag 'md-6.9-20240408' of https://git.kernel.org/pub/scm/linux/kernel/git/song/md into block-6.9

Pull MD fix from Song:

"This change, by Yu Kuai, fixes a UAF in a corner case."

* tag 'md-6.9-20240408' of https://git.kernel.org/pub/scm/linux/kernel/git/song/md:
  raid1: fix use-after-free for original bio in raid1_write_request()

Author: axboe

drivers/md/raid1.c

@@ -1558,7 +1558,7 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio,
 		for (j = 0; j < i; j++)
 			if (r1_bio->bios[j])
 				rdev_dec_pending(conf->mirrors[j].rdev, mddev);
-		free_r1bio(r1_bio);
+		mempool_free(r1_bio, &conf->r1bio_pool);
 		allow_barrier(conf, bio->bi_iter.bi_sector);
 
 		if (bio->bi_opf & REQ_NOWAIT) {