linux-kernel - Re: [PATCH v3 07/16] tpm: access command header through struct in tpm_try

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Message-Id: <739339e6-4cd3-974d-617e-9e64cb2195cb@linux.ibm.com>
Date:   Mon, 5 Nov 2018 17:26:30 -0500
From:   Stefan Berger <stefanb@...ux.ibm.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        linux-integrity@...r.kernel.org
Cc:     linux-security-module@...r.kernel.org,
        James Bottomley <James.Bottomley@...senPartnership.com>,
        Tomas Winkler <tomas.winkler@...el.com>,
        Tadeusz Struk <tadeusz.struk@...el.com>,
        Stefan Berger <stefanb@...ux.vnet.ibm.com>,
        Nayna Jain <nayna@...ux.ibm.com>,
        Peter Huewe <peterhuewe@....de>,
        Jason Gunthorpe <jgg@...pe.ca>, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 07/16] tpm: access command header through struct in
 tpm_try_transmit()

On 11/4/18 8:45 PM, Jarkko Sakkinen wrote:
> Instead of accessing fields of the command header through offsets to
> the raw buffer, it is a better idea to use the header struct pointer
> that is already used elsewhere in the function.
>
> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
> ---
>   drivers/char/tpm/tpm-interface.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
> index 0f343407daf8..422e3bb0bd3d 100644
> --- a/drivers/char/tpm/tpm-interface.c
> +++ b/drivers/char/tpm/tpm-interface.c
> @@ -190,8 +190,8 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip,
>   	if (bufsiz > TPM_BUFSIZE)
>   		bufsiz = TPM_BUFSIZE;
>
> -	count = be32_to_cpu(*((__be32 *) (buf + 2)));
> -	ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
> +	count = be32_to_cpu(header->length);
> +	ordinal = be32_to_cpu(header->return_code);

Hm. This should use the proper type of header and use in_header->ordinal.


>   	if (count == 0)
>   		return -ENODATA;
>   	if (count > bufsiz) {