From: =?UTF-8?q?M=C3=A5rten=20Lindahl?= <marten.lindahl@axis.com>
Date: Thu, 30 Mar 2023 16:40:59 +0200
Subject: [PATCH] ubifs: Fix memory leak in do_rename
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
References: bsc#1012628
Patch-mainline: 6.3.2
Git-commit: 3a36d20e012903f45714df2731261fdefac900cb

commit 3a36d20e012903f45714df2731261fdefac900cb upstream.

If renaming a file in an encrypted directory, function
fscrypt_setup_filename allocates memory for a file name. This name is
never used, and before returning to the caller the memory for it is not
freed.

When running kmemleak on it we see that it is registered as a leak. The
report below is triggered by a simple program 'rename' that renames a
file in an encrypted directory:

  unreferenced object 0xffff888101502840 (size 32):
    comm "rename", pid 9404, jiffies 4302582475 (age 435.735s)
    backtrace:
      __kmem_cache_alloc_node
      __kmalloc
      fscrypt_setup_filename
      do_rename
      ubifs_rename
      vfs_rename
      do_renameat2

To fix this we can remove the call to fscrypt_setup_filename as it's not
needed.

Fixes: 278d9a243635f26 ("ubifs: Rename whiteout atomically")
Reported-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Mårten Lindahl <marten.lindahl@axis.com>
Reviewed-by: Zhihao Cheng <chengzhihao1@huawei.com>
Cc: stable@vger.kernel.org
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 fs/ubifs/dir.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c
index 5f33dbad..ef0499ed 100644
--- a/fs/ubifs/dir.c
+++ b/fs/ubifs/dir.c
@@ -358,7 +358,6 @@ static struct inode *create_whiteout(struct inode *dir, struct dentry *dentry)
 	umode_t mode = S_IFCHR | WHITEOUT_MODE;
 	struct inode *inode;
 	struct ubifs_info *c = dir->i_sb->s_fs_info;
-	struct fscrypt_name nm;
 
 	/*
 	 * Create an inode('nlink = 1') for whiteout without updating journal,
@@ -369,10 +368,6 @@ static struct inode *create_whiteout(struct inode *dir, struct dentry *dentry)
 	dbg_gen("dent '%pd', mode %#hx in dir ino %lu",
 		dentry, mode, dir->i_ino);
 
-	err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm);
-	if (err)
-		return ERR_PTR(err);
-
 	inode = ubifs_new_inode(c, dir, mode, false);
 	if (IS_ERR(inode)) {
 		err = PTR_ERR(inode);
@@ -395,7 +390,6 @@ static struct inode *create_whiteout(struct inode *dir, struct dentry *dentry)
 	make_bad_inode(inode);
 	iput(inode);
 out_free:
-	fscrypt_free_filename(&nm);
 	ubifs_err(c, "cannot create whiteout file, error %d", err);
 	return ERR_PTR(err);
 }
-- 
2.35.3