linux-kernel - RE: [PATCH] tpm: tpm_try_transmit() refactor error flow.

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Date:   Sat, 20 Oct 2018 22:49:40 +0000
From:   "Winkler, Tomas" <tomas.winkler@...el.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
CC:     Jason Gunthorpe <jgg@...pe.ca>,
        Nayna Jain <nayna@...ux.vnet.ibm.com>,
        "Usyskin, Alexander" <alexander.usyskin@...el.com>,
        "Struk, Tadeusz" <tadeusz.struk@...el.com>,
        "linux-integrity@...r.kernel.org" <linux-integrity@...r.kernel.org>,
        "linux-security-module@...r.kernel.org" 
        <linux-security-module@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: RE: [PATCH] tpm: tpm_try_transmit() refactor error flow.

> 
> On Thu, 18 Oct 2018, Winkler, Tomas wrote:
> >> -----Original Message-----
> >> From: Jarkko Sakkinen [mailto:jarkko.sakkinen@...ux.intel.com]
> >> Sent: Thursday, October 18, 2018 03:15
> >> To: Winkler, Tomas <tomas.winkler@...el.com>
> >> Cc: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>; Jason
> >> Gunthorpe <jgg@...pe.ca>; Nayna Jain <nayna@...ux.vnet.ibm.com>;
> >> Usyskin, Alexander <alexander.usyskin@...el.com>; Struk, Tadeusz
> >> <tadeusz.struk@...el.com>; linux-integrity@...r.kernel.org;
> >> linux-security- module@...r.kernel.org; linux-kernel@...r.kernel.org;
> >> stable@...r.kernel.org
> >> Subject: Re: [PATCH] tpm: tpm_try_transmit() refactor error flow.
> >>
> >> On Tue, 16 Oct 2018, Tomas Winkler wrote:
> >>> First, rename out_no_locality to out_locality for bailing out on
> >>> both
> >>> tpm_cmd_ready() and tpm_request_locality() failure.
> >>
> >> This is unnecessary change and technically it is not a rename: the
> >> commit message text and the code change do not match. Rename is just
> >> a rename (i.e. change a variable name foo to bar).
> >
> > I'm renaming the label because it doesn't match the code flow anymore,
> > I can change the commit message, but you please review the code.
> > Tomas
> 
> The flow change is unnecessary and does not really have anything to do with
> the bug fix. 

What I see in the original code is that when 
tpm_cmd_ready()  fails it's jumps to 'out' label and trying to do tpm_go_idle()
but instead it should just undoing the locality, so both cmd_read and go idle had a wrong 
jump. I see both should  be fixed.

Earlier version was better than this and would have been fine
> when taking account the remark from Jason.