Re: [PATCH v5 2/3] tpm: enhance read_log_of() to support Physical TPM event log

[Nayna]

On 11/24/2016 01:07 AM, Jason Gunthorpe wrote:
> On Wed, Nov 23, 2016 at 12:27:36PM -0500, Nayna Jain wrote:
> >   	sizep = of_get_property(np, "linux,sml-size", NULL);
> > +	if (of_property_match_string(np, "compatible", "IBM,vtpm") < 0)
> > +		log_size = be32_to_cpup(sizep);
> > +	else
> > +		log_size = *sizep;
> > +
>
> Uh, no, sizep can be null at this point:

Oops !! Missed the basic. Will fix it. Sorry, and Thanks for noticing.

> >   	basep = of_get_property(np, "linux,sml-base", NULL);
> >   	if (sizep == NULL && basep == NULL)
> >   		return -ENODEV;
> >   	if (sizep == NULL || basep == NULL)
> >   		return -EIO;
>
> Move the if here.

Yeah..

> > -	if (*sizep == 0) {
> > +	if (log_size == 0) {
> >   		dev_warn(&chip->dev, "%s: Event log area empty\n", __func__);
> >   		return -EIO;
> >   	}
> >
> > -	log->bios_event_log = kmalloc(*sizep, GFP_KERNEL);
> > +	log->bios_event_log = kmalloc(log_size, GFP_KERNEL);
> >   	if (!log->bios_event_log)
> >   		return -ENOMEM;
> >
> > -	log->bios_event_log_end = log->bios_event_log + *sizep;
> > +	log->bios_event_log_end = log->bios_event_log + log_size;
> >
> > -	memcpy(log->bios_event_log, __va(*basep), *sizep);
> > +	if (of_property_match_string(np, "compatible", "IBM,vtpm") < 0)
> > +		memcpy(chip->log.bios_event_log, __va(be64_to_cpup(basep)),
> > +		       log_size);
> > +	else
> > +		memcpy(chip->log.bios_event_log, __va(*basep),
> > log_size);
>
> And move the conditional swap of basep up to be along side sizep as
> well (ie get rid of the second of_property_match_string)

Yeah.. true.. Will fix this also.

Thanks & Regards,
   - Nayna

> Jason