ntfs3: CVE-2022-3238

ntfs3: CVE-2022-3238

[zhongjinghua]

Hi !

I have a question to ask for CVE-2022-3238.

This issue seems to have been fixed by the mainline patch: cd39981fb92adf0cc736112f87e3e61602baa415.

I didn't reproduce the problem when I verified the mainline code, but it did when I rolled back this patch.

So I would like to ask if this patch is a patch to fix this CVE problem.

CVE link: https://access.redhat.com/security/cve/CVE-2022-3238

Vulnerability trigger path:

------remount------
do_mount
    path_mount
        do_remount
            put_fs_context
                fc->ops->free(fc);
                ntfs_fs_free
                    put_mount_options
                        kfree(opts->nls_name);

------umount------
kill_block_super
    generic_shutdown_super
        ntfs_put_super
            put_mount_options
                kfree(opts->nls_name);

cd39981fb92adf0cc736112f87e3e61602baa415：https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?h=v6.1-rc3&id=cd39981fb92adf0cc736112f87e3e61602baa415
This problem triggers：
ntfs_init_fs_context:
       sbi->options = opts; 
       fc->s_fs_info = sbi;
ok:
       fc->fs_private = opts;
       fc->ops = &ntfs_context_ops;

The two references are the same.