On Tue, Jan 17, 2017 at 05:27:47PM -0500, Stefan Berger wrote:
> On 01/17/2017 09:49 AM, Jarkko Sakkinen wrote:
> > On Mon, Jan 16, 2017 at 04:41:11PM -0500, Stefan Berger wrote:
> >
> > > + * @min_rx_length: minimum expected length of response
> > Please, rename as min_rsp_body_len and change the description
> > accordingly.
> >
> > > * @flags: tpm transmit flags - bitmap
> > > * @desc: command description used in the error message
> > > *
> > > @@ -434,25 +435,34 @@ ssize_t tpm_transmit(struct tpm_chip *chip, const
> > > u8 *buf, size_t bufsiz,
> > > * A positive number for a TPM error.
> > > */
> > > ssize_t tpm_transmit_cmd(struct tpm_chip *chip, const void *cmd,
> > > - int len, unsigned int flags, const char *desc)
> > > + size_t cmd_length, size_t min_rx_length,
> > > + unsigned int flags, const char *desc)
> > > {
> > > const struct tpm_output_header *header;
> > > int err;
> > > + ssize_t len;
> > > - len = tpm_transmit(chip, (const u8 *)cmd, len, flags);
> > > + len = tpm_transmit(chip, (const u8 *)cmd, cmd_length, flags);
> > > if (len < 0)
> > > return len;
> > > else if (len < TPM_HEADER_SIZE)
> > > return -EFAULT;
> > > header = cmd;
> > > + if (len < be32_to_cpu(header->length))
> > > + return -EFAULT;
> > > err = be32_to_cpu(header->return_code);
> > > if (err != 0 && desc)
> > > dev_err(&chip->dev, "A TPM error (%d) occurred %s\n",
> > > err,
> > > desc);
> > > + if (err)
> > > + return err;
> > > - return err;
> > > + if (be32_to_cpu(header->length) < min_rx_length)
> > > + return -EFAULT;
> > > +
> > > + return 0;
> > > }
> > > #define TPM_DIGEST_SIZE 20
> > > @@ -468,7 +478,7 @@ static const struct tpm_input_header
> > > tpm_getcap_header = {
> > > };
> > > ssize_t tpm_getcap(struct tpm_chip *chip, u32 subcap_id, cap_t *cap,
> > > - const char *desc)
> > > + const char *desc, size_t min_cap_length)
> > tpm_getcap update should be its own commit.
>
> tpm_getcap needs to pass something as min_rsp_body_length to
> tpm_transmit_cmd. What would it pass?
I do not understand the problem. You are already
TPM_HEADER_SIZE + min_cap_length
/Jarkko
