[net-next] sysfs: Fix regression when adding a file to an existing group

Commit 5f81880d5204 ("sysfs, kobject: allow creating kobject belonging
to arbitrary users") incorrectly changed the argument passed as the
parent parameter when calling sysfs_add_file_mode_ns(). This caused some
sysfs attribute files to not be added correctly to certain groups.

Fixes: 5f81880d5204 ("sysfs, kobject: allow creating kobject belonging to arbitrary users")
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Reported-by: Heiner Kallweit <hkallweit1@gmail.com>
---

Note, this was a regression exclusively in linux-next and never made it to
Linus' tree. There's no need to queue it up for linux-stable.

 fs/sysfs/file.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

On 27.07.2018 23:33, Tyler Hicks wrote:
> Commit 5f81880d5204 ("sysfs, kobject: allow creating kobject belonging
> to arbitrary users") incorrectly changed the argument passed as the
> parent parameter when calling sysfs_add_file_mode_ns(). This caused some
> sysfs attribute files to not be added correctly to certain groups.
> 
> Fixes: 5f81880d5204 ("sysfs, kobject: allow creating kobject belonging to arbitrary users")
> Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
> Reported-by: Heiner Kallweit <hkallweit1@gmail.com>
> ---
> 
> Note, this was a regression exclusively in linux-next and never made it to
> Linus' tree. There's no need to queue it up for linux-stable.
> 
>  fs/sysfs/file.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
> index fa46216523cf..052e5ad9a4d2 100644
> --- a/fs/sysfs/file.c
> +++ b/fs/sysfs/file.c
> @@ -373,7 +373,7 @@ int sysfs_add_file_to_group(struct kobject *kobj,
>  		return -ENOENT;
>  
>  	kobject_get_ownership(kobj, &uid, &gid);
> -	error = sysfs_add_file_mode_ns(kobj->sd, attr, false,
> +	error = sysfs_add_file_mode_ns(parent, attr, false,
>  				       attr->mode, uid, gid, NULL);
>  	kernfs_put(parent);
>  
> 
Tested-by: Heiner Kallweit <hkallweit1@gmail.com>

From: Tyler Hicks <tyhicks@canonical.com>
Date: Fri, 27 Jul 2018 21:33:27 +0000

> Commit 5f81880d5204 ("sysfs, kobject: allow creating kobject belonging
> to arbitrary users") incorrectly changed the argument passed as the
> parent parameter when calling sysfs_add_file_mode_ns(). This caused some
> sysfs attribute files to not be added correctly to certain groups.
> 
> Fixes: 5f81880d5204 ("sysfs, kobject: allow creating kobject belonging to arbitrary users")
> Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
> Reported-by: Heiner Kallweit <hkallweit1@gmail.com>
> ---
> 
> Note, this was a regression exclusively in linux-next and never made it to
> Linus' tree. There's no need to queue it up for linux-stable.

Applied, thank you.