Re: [PATCH] btrfs: Fix missing close devices

[Johannes Thumshirn]

On 21/09/2020 10:27, qiang.zhang@xxxxxxxxxxxxx wrote:
> From: Zqiang <qiang.zhang@xxxxxxxxxxxxx>
> 
> When the btrfs fill super error, we should first close devices and
> then call deactivate_locked_super func to free fs_info.
> 
> Signed-off-by: Zqiang <qiang.zhang@xxxxxxxxxxxxx>
> ---
>  fs/btrfs/super.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
> index 8840a4fa81eb..3bfd54e8f388 100644
> --- a/fs/btrfs/super.c
> +++ b/fs/btrfs/super.c
> @@ -1675,6 +1675,7 @@ static struct dentry *btrfs_mount_root(struct file_system_type *fs_type,
>  		error = security_sb_set_mnt_opts(s, new_sec_opts, 0, NULL);
>  	security_free_mnt_opts(&new_sec_opts);
>  	if (error) {
> +		btrfs_close_devices(fs_devices);
>  		deactivate_locked_super(s);
>  		return ERR_PTR(error);
>  	}
> 

I think this is the fix for the syzkaller issue: 
Reported-by: syzbot+582e66e5edf36a22c7b0@xxxxxxxxxxxxxxxxxxxxxxxxx