On Tue, Mar 25, 2025 at 11:46:29AM +0100, Miklos Szeredi wrote:
> In theory overlayfs could support upper layer directly referring to a data
> layer, but there's no current use case for this.
>
> Originally, when data-only layers were introduced, this wasn't allowed,
> only introduced by the "datadir+" feature, but without actually handling
> this case, resulting in an Oops.
>
> Fix by disallowing datadir without lowerdir.
>
> Reported-by: Giuseppe Scrivano <gscrivan@xxxxxxxxxx>
> Fixes: 24e16e385f22 ("ovl: add support for appending lowerdirs one by one")
> Cc: <stable@xxxxxxxxxxxxxxx> # v6.7
> Reviewed-by: Amir Goldstein <amir73il@xxxxxxxxx>
> Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxxxxx>
> ---
Reviewed-by: Christian Brauner <brauner@xxxxxxxxxx>
