Re: [PATCH v3 3/5] zram: add level validation in zstd setup_params

On Thu, Jul 30, 2026 at 11:10 AM Sergey Senozhatsky
<[email protected]> wrote:
>
> On (26/07/30 10:52), Haoqin Huang wrote:
> [..]
> > diff --git a/drivers/block/zram/backend_zstd.c b/drivers/block/zram/backend_zstd.c
> > index 2584f47c9b3c..6febb366f76e 100644
> > --- a/drivers/block/zram/backend_zstd.c
> > +++ b/drivers/block/zram/backend_zstd.c
> > @@ -60,6 +60,11 @@ static int zstd_setup_params(struct zcomp_params *params)
> >       params->drv_data = zp;
> >       if (params->level == ZCOMP_PARAM_NOT_SET)
> >               params->level = zstd_default_clevel();
> > +     else if (params->level < -(int)ZSTD_TARGETLENGTH_MAX ||
>
> I was expecting to see zstd_min_clevel() here.  What is this
> -(int)ZSTD_TARGETLENGTH_MAX?
>

Ah yes, that was an oversight, it should be zstd_min_clevel().
Fixed in v4.

> > +              params->level > zstd_max_clevel()) {
> > +             pr_err("zstd: invalid compression level %d\n", params->level);
> > +             goto error;
> > +     }