From 8468f45091d2866affed6f6a7aecc20779139173 Mon Sep 17 00:00:00 2001
From: Coly Li <colyli@suse.de>
Date: Wed, 3 Nov 2021 14:49:17 +0800
Subject: [PATCH] bcache: fix use-after-free problem in bcache_device_free()
Git-commit: 8468f45091d2866affed6f6a7aecc20779139173
Patch-mainline: v5.16-rc1
References: git-fixes

In bcache_device_free(), pointer disk is referenced still in
ida_simple_remove() after blk_cleanup_disk() gets called on this
pointer. This may cause a potential panic by use-after-free on the
disk pointer.

This patch fixes the problem by calling blk_cleanup_disk() after
ida_simple_remove().

Fixes: bc70852fd104 ("bcache: convert to blk_alloc_disk/blk_cleanup_disk")
Signed-off-by: Coly Li <colyli@suse.de>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Ulf Hansson <ulf.hansson@linaro.org>
Cc: stable@vger.kernel.org # v5.14+
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20211103064917.67383-1-colyli@suse.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

---
 drivers/md/bcache/super.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -890,9 +890,9 @@ static void bcache_device_free(struct bc
 		if (disk_added)
 			del_gendisk(disk);
 
-		blk_cleanup_disk(disk);
 		ida_simple_remove(&bcache_device_idx,
 				  first_minor_to_idx(disk->first_minor));
+		blk_cleanup_disk(disk);
 	}
 
 	bioset_exit(&d->bio_split);