linux-kernel - Re: [PATCH v2 1/2] tpm: Fix error handling in async work

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Date:   Thu, 6 Jan 2022 18:51:41 -0800
From:   Tadeusz Struk <tadeusz.struk@...aro.org>
To:     Jarkko Sakkinen <jarkko@...nel.org>,
        Tadeusz Struk <tstruk@...il.com>
Cc:     Jason Gunthorpe <jgg@...pe.ca>, linux-integrity@...r.kernel.org,
        stable@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] tpm: Fix error handling in async work

On 1/5/22 12:05, Jarkko Sakkinen wrote:
>> until the user_read_timer wakes it up after 120 sec.
>> Make sure that error conditions also contribute to the poll mask
>> so that a correct error code could passed back to the caller.
> I'm not sure what "making sure" means.



> 
>>          tpm_put_ops(priv->chip);
>> -       if (ret > 0) {
>> +       if (ret != 0) {
> What if ret < 0?
> 
> You should explain this change in the commit message. Also, consider
> adding an inline comment.

As the commit message says tpm_dev_transmit() returns -EINVAL when
the given handle doesn't exist, and the tmprm can not find it.
This is not handled properly and the application gets stuck.
I will add a comment here send a new version.

-- 
Thanks,
Tadeusz