FAILED: patch "[PATCH] bcache: fix use-after-free problem in bcache_device_free()" failed to apply to 5.14-stable tree

The patch below does not apply to the 5.14-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 8468f45091d2866affed6f6a7aecc20779139173 Mon Sep 17 00:00:00 2001
From: Coly Li <[email protected]>
Date: Wed, 3 Nov 2021 14:49:17 +0800
Subject: [PATCH] bcache: fix use-after-free problem in bcache_device_free()

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().

index 84a48eed8e24..a7bb3355b776 100644
@@ -885,9 +885,9 @@ static void bcache_device_free(struct bcache_device *d)
 		bcache_device_detach(d);
 
 	if (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);