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: 095531f891e6 ("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>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index 31b86e027f9d..3a3a7a548a85 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -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)