Re: [PATCH] ovl: Pass ovl_get_nlink() parameters in right order

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On Mon, Nov 27, 2017 at 5:12 PM, Vivek Goyal <vgoyal@xxxxxxxxxx> wrote:
> Hi Amir,
>
> I am wondering if this is a bug or it is supposed to be like this. I felt
> it is a bug, so I generated a patch and sending it for your review.
>

Yap. That's a bug. Good catch!
I fixed test overlay/033 to catch it.

Please add cc:stable # v4.13 and Fixes tag.

Thanks!
Amir.

> Vivek
>
>
> Right now we seem to be passing index as "lowerdentry" and origin.dentry
> as "upperdentry". IIUC, we should pass these parameters in reversed order
> and this looks like a bug.
>
> Signed-off-by: Vivek Goyal <vgoyal@xxxxxxxxxx>
> ---
>  fs/overlayfs/namei.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/fs/overlayfs/namei.c b/fs/overlayfs/namei.c
> index 625ed8066570..5ef69bc09e0c 100644
> --- a/fs/overlayfs/namei.c
> +++ b/fs/overlayfs/namei.c
> @@ -435,7 +435,7 @@ int ovl_verify_index(struct dentry *index, struct ovl_path *lower,
>
>         /* Check if index is orphan and don't warn before cleaning it */
>         if (d_inode(index)->i_nlink == 1 &&
> -           ovl_get_nlink(index, origin.dentry, 0) == 0)
> +           ovl_get_nlink(origin.dentry, index, 0) == 0)
>                 err = -ENOENT;
>
>         dput(origin.dentry);
--
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