From: =?UTF-8?q?M=C3=A5rten=20Lindahl?= <marten.lindahl@axis.com>
Date: Thu, 30 Mar 2023 11:32:14 +0200
Subject: [PATCH] ubifs: Free memory for tmpfile name
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References: bsc#1012628
Patch-mainline: 6.3.2
Git-commit: 1fb815b38bb31d6af9bd0540b8652a0d6fe6cfd3

commit 1fb815b38bb31d6af9bd0540b8652a0d6fe6cfd3 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 fs/ubifs/dir.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c
index 1505539f..5f33dbad 100644
--- a/fs/ubifs/dir.c
+++ b/fs/ubifs/dir.c
@@ -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);
 
-- 
2.35.3