[PATCH v4] iommu/riscv: prevent NULL deref in iova_to_phys

[XianLiang Huang]

https://lore.kernel.org/lkml/feb46658-5a3a-4403-b407-500566280eb3@web.de/

I updated the patch in v3, and updated change description accordingly:

In v1
> -	if (_io_pte_none(*ptr) || !_io_pte_present(*ptr))
> +	if (!ptr || _io_pte_none(*ptr) || !_io_pte_present(*ptr))

In v3
> -	if (_io_pte_none(*ptr) || !_io_pte_present(*ptr))
> +	if (!ptr)

but put your proposal at the patch Subject...
  v1: check pte null pointer before use
  v3: prevent NULL deref in iova_to_phys

> …> ---
> > Changes
> > v4:
> > - Change the summary as Markus recommends
> > 
> > v3:
sorry for making this messy.

Regards,
Xianliang