linux-kernel - Re: [tpmdd-devel] [PATCH RFC v2 3/5] tpm: infrastructure for TPM spaces

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Date:   Thu, 12 Jan 2017 10:38:30 -0800
From:   James Bottomley <James.Bottomley@...senPartnership.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        tpmdd-devel@...ts.sourceforge.net
Cc:     open list <linux-kernel@...r.kernel.org>,
        linux-security-module@...r.kernel.org
Subject: Re: [tpmdd-devel] [PATCH RFC v2 3/5] tpm: infrastructure for TPM
 spaces

On Thu, 2017-01-12 at 19:46 +0200, Jarkko Sakkinen wrote:
> @@ -435,17 +440,23 @@ ssize_t tpm_transmit(struct tpm_chip *chip,
> const u8 *buf, size_t bufsiz,
>         goto out;
> 
>  out_recv:
> -       rc = chip->ops->recv(chip, (u8 *) buf, bufsiz);
> -       if (rc < 0)
> +       len = chip->ops->recv(chip, (u8 *) buf, bufsiz);
> +       if (len < 0) {
>                 dev_err(&chip->dev,
> -                       "tpm_transmit: tpm_recv: error %zd\n", rc);
> +                       "tpm_transmit: tpm_recv: error %d\n", rc);
> +               rc = len;
> +               goto out;
> +       }
> +
> +       rc = tpm2_commit_space(chip, space, ordinal, buf, bufsiz);

I think this should be

rc = tpm2_commit_space(chip, space, ordinal, buf, len)

because tpm2_commit_space wants to know the length of the response, not
the length of the original command.

James