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

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Message-ID: <20190219173120.GA15462@linux.intel.com>
Date:   Tue, 19 Feb 2019 19:31:20 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Jason Gunthorpe <jgg@...pe.ca>
Cc:     YueHaibing <yuehaibing@...wei.com>, peterhuewe@....de,
        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 09:34:56AM -0700, Jason Gunthorpe wrote:
> > - 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.
> 
> Clarity of the code is a laudible goal - not everything is about
> fixing bugs or adding features.
> 
> It is much easier to write the code properly than to try and prove
> that event_size can not exceed INT_MAX.

I think it is actually a regression in 4d23cc323cdb.  Should carry a
fixes tag. I did not quite undersand what commit message was saying.
What it should would just

"""
tpm: Fix the type of the return value in calc_tpm2_event_size()

calc_tpm2_event_size() has an invalid signature because it returns a 'size_t'
where as its signature says that it returns 'int'.
"""

Should be also Cc'd to linux-security-module and have cc to stable.

/Jarkko