On Wed, Jun 30, 2021 at 2:03 PM Ulf Hansson <ulf.hansson@xxxxxxxxxx> wrote:
> > diff --git a/drivers/mmc/core/sdio_ops.c b/drivers/mmc/core/sdio_ops.c
> > index 4c229dd2b6e5..845f9ca3b200 100644
> > --- a/drivers/mmc/core/sdio_ops.c
> > +++ b/drivers/mmc/core/sdio_ops.c
> > @@ -124,6 +124,7 @@ int mmc_io_rw_extended(struct mmc_card *card, int
> > write, unsigned fn,
> > int err;
> >
> > WARN_ON(blksz == 0);
> > + WARN_ON_ONCE(is_vmalloc_or_module_addr(buf) || object_is_on_stack(buf));
>
> Looks reasonable to me, at least we should start giving a warning.
> Would you like to send a formal patch that we can test?
Done.
Arnd
