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ubifs: Fix memory leak in do_rename

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[ Upstream commit 3a36d20e01 ]

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: 278d9a2436 ("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: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Mårten Lindahl 2023-03-30 16:40:59 +02:00 • committed by Justin Hammond
parent 7e79a50ded
commit 1dc4cb5247
1 changed files with 0 additions and 6 deletions
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6
fs/ubifs/dir.c
View file

@ -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 @@ out_inode:
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);
}