linux-kernel - [PATCH 1/8] securityfs: don't pin dentries twice, once is enough...

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Message-ID: <20250509043757.GL2023217@ZenIV>
Date: Fri, 9 May 2025 05:37:57 +0100
From: Al Viro <viro@...iv.linux.org.uk>
To: alexjlzheng@...il.com
Cc: paul@...l-moore.com, jmorris@...ei.org, serge@...lyn.com,
	greg@...ah.com, chrisw@...l.org,
	linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jinliang Zheng <alexjlzheng@...cent.com>
Subject: [PATCH 1/8] securityfs: don't pin dentries twice, once is enough...

>From 5c463d47c814e16adb6e997a05ca5625df41152d Mon Sep 17 00:00:00 2001
From: Al Viro <viro@...iv.linux.org.uk>
Date: Thu, 8 May 2025 23:38:01 -0400
Subject: [PATCH 1/8] securityfs: don't pin dentries twice, once is enough...

incidentally, securityfs_recursive_remove() is broken without that -
it leaks dentries, since simple_recursive_removal() does not expect
anything of that sort.  It could be worked around by dput() in
remove_one() callback, but it's easier to just drop that double-get
stuff.

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
 security/inode.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/security/inode.c b/security/inode.c
index da3ab44c8e57..58cc60c50498 100644
--- a/security/inode.c
+++ b/security/inode.c
@@ -159,7 +159,6 @@ static struct dentry *securityfs_create_dentry(const char *name, umode_t mode,
 		inode->i_fop = fops;
 	}
 	d_instantiate(dentry, inode);
-	dget(dentry);
 	inode_unlock(dir);
 	return dentry;
 
@@ -306,7 +305,6 @@ void securityfs_remove(struct dentry *dentry)
 			simple_rmdir(dir, dentry);
 		else
 			simple_unlink(dir, dentry);
-		dput(dentry);
 	}
 	inode_unlock(dir);
 	simple_release_fs(&mount, &mount_count);
-- 
2.39.5