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tpm: Return the actual size when receiving an unsupported command 

The userpace expects to read the number of bytes stated in the header.
Returning the size of the buffer instead would be unexpected.

Cc: stable@vger.kernel.org
Fixes: 095531f891 ("tpm: return a TPM_RC_COMMAND_CODE response if command is not implemented")
Signed-off-by: Ricardo Schwarzmeier <Ricardo.Schwarzmeier@infineon.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
This commit is contained in:
Ricardo Schwarzmeier 2018-06-26 17:31:45 +02:00 committed by Jarkko Sakkinen
parent 627448e85c
commit 36a11029b0
1 changed files with 1 additions and 1 deletions
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2
drivers/char/tpm/tpm-interface.c
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@ -450,7 +450,7 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip,
header->tag = cpu_to_be16(TPM2_ST_NO_SESSIONS);
header->return_code = cpu_to_be32(TPM2_RC_COMMAND_CODE |
TSS2_RESMGR_TPM_RC_LAYER);
return bufsiz;
return sizeof(*header);
}
if (bufsiz > TPM_BUFSIZE)