Commit 36a11029 authored Jun 26, 2018 by Ricardo Schwarzmeier Committed by Jarkko Sakkinen Jul 28, 2018

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: 095531f8 ("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>

parent 627448e8

drivers/char/tpm/tpm-interface.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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)