The patch below does not apply to the 5.15-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 stable@vger.kernel.org.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y git checkout FETCH_HEAD git cherry-pick -x 3a36d20e012903f45714df2731261fdefac900cb # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2023050607-arena-skimmer-cb9c@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..

Possible dependencies:

3a36d20e0129 ("ubifs: Fix memory leak in do_rename") a0c515657307 ("ubifs: Fix AA deadlock when setting xattr for encrypted file") 278d9a243635 ("ubifs: Rename whiteout atomically") afd427048047 ("ubifs: Fix deadlock in concurrent rename whiteout and inode writeback") 40a8f0d5e7b3 ("ubifs: rename_whiteout: Fix double free for whiteout_ui->data")

thanks,

greg k-h

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

From 3a36d20e012903f45714df2731261fdefac900cb Mon Sep 17 00:00:00 2001 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

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

diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c index 5f33dbad27f6..ef0499edc248 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); }