The command size is computed for the header anyway.
It can as well indicate the correct number of bytes to read from the driver.
Fixes: 095531f891e6 ("tpm: return a TPM_RC_COMMAND_CODE response if command is not implemented")
Signed-off-by: Ricardo Schwarzmeier <Ricardo.Schwarzmeier@xxxxxxxxxxxx>
---
drivers/char/tpm/tpm-interface.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index e32f6e85dc6d..0923e81505a5 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -423,7 +423,7 @@ 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 header->length;
}
if (bufsiz > TPM_BUFSIZE)
--
2.17.1
