This is now possible thanks to the disconnected directory fix.

Cc: Günther Noack <gnoack@google.com>
Cc: Song Liu <song@kernel.org>
Cc: Tingmao Wang <m@maowtm.org>
Signed-off-by: Mickaël Salaün <mic@digikod.net>
---

Changes since v3:
- New patch extracted from the previous one.
---
 security/landlock/fs.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/security/landlock/fs.c b/security/landlock/fs.c
index a2ed0e76938a..8998fa4ca5f0 100644
--- a/security/landlock/fs.c
+++ b/security/landlock/fs.c
@@ -837,7 +837,6 @@ static bool is_access_to_paths_allowed(
 	 * restriction.
 	 */
 	while (true) {
-		struct dentry *parent_dentry;
 		const struct landlock_rule *rule;
 
 		/*
@@ -930,7 +929,9 @@ static bool is_access_to_paths_allowed(
 			walker_path.dentry = walker_path.mnt->mnt_root;
 			dget(walker_path.dentry);
 		} else {
-			parent_dentry = dget_parent(walker_path.dentry);
+			struct dentry *const parent_dentry =
+				dget_parent(walker_path.dentry);
+
 			dput(walker_path.dentry);
 			walker_path.dentry = parent_dentry;
 		}
-- 
2.51.0