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ubifs: Free memory for tmpfile name

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When opening a ubifs tmpfile on an encrypted directory, function
fscrypt_setup_filename allocates memory for the name that is to be
stored in the directory entry, but after the name has been copied to the
directory entry inode, the memory 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 'tmpfile' just opening a
tmpfile:

  unreferenced object 0xffff88810178f380 (size 32):
    comm "tmpfile", pid 509, jiffies 4294934744 (age 1524.742s)
    backtrace:
      __kmem_cache_alloc_node
      __kmalloc
      fscrypt_setup_filename
      ubifs_tmpfile
      vfs_tmpfile
      path_openat

Free this memory after it has been copied to the inode.

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>
This commit is contained in:
Mårten Lindahl 2023-03-30 11:32:14 +02:00 committed by Richard Weinberger
parent 31a149d5c1
commit 1fb815b38b
1 changed files with 1 additions and 0 deletions
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fs/ubifs/dir.c
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@ -492,6 +492,7 @@ static int ubifs_tmpfile(struct mnt_idmap *idmap, struct inode *dir,
unlock_2_inodes(dir, inode);
ubifs_release_budget(c, &req);
fscrypt_free_filename(&nm);
return finish_open_simple(file, 0);