linux-kernel - Re: [PATCH -next] tpm: change the return type of calc_tpm2_event_size to size

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Message-ID: <20190219103532.GA16707@linux.intel.com>
Date:   Tue, 19 Feb 2019 12:35:32 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     YueHaibing <yuehaibing@...wei.com>
Cc:     peterhuewe@....de, jgg@...pe.ca, arnd@...db.de,
        gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        linux-integrity@...r.kernel.org
Subject: Re: [PATCH -next] tpm: change the return type of
 calc_tpm2_event_size to size_t

On Tue, Feb 19, 2019 at 05:15:47PM +0800, YueHaibing wrote:
> On 2019/2/19 16:59, Jarkko Sakkinen wrote:
> > On Tue, Feb 19, 2019 at 03:26:18PM +0800, YueHaibing wrote:
> >> calc_tpm2_event_size return size of the event which type is
> >> size_t, If it is an invalid event, returns 0. And all the
> >> caller use a size_t variable to check the return value, so
> >> no need to convert to the return value type to int.
> >>
> >> Signed-off-by: YueHaibing <yuehaibing@...wei.com>
> > 
> > I don't see this patch make any value.
> 
> calc_tpm2_event_size return size_t 'size' which derive from u32 'event_field->event_size',
> 
> convert it to int may result in truncation.

Two remarks:

- Your real name is formatted incorrectly. It should be like "Yue Haibig"
  as shown in [1].
- If there is no actual regression, this change is useless.

[1] https://www.kernel.org/doc/html/v4.17/process/submitting-patches.html

/Jarkko