| From 9716ac65efc8f780549b03bddf41e60c445d4709 Mon Sep 17 00:00:00 2001 |
| From: Stefan Berger <stefanb@linux.ibm.com> |
| Date: Wed, 10 Mar 2021 17:19:16 -0500 |
| Subject: tpm: vtpm_proxy: Avoid reading host log when using a virtual device |
| |
| From: Stefan Berger <stefanb@linux.ibm.com> |
| |
| commit 9716ac65efc8f780549b03bddf41e60c445d4709 upstream. |
| |
| Avoid allocating memory and reading the host log when a virtual device |
| is used since this log is of no use to that driver. A virtual |
| device can be identified through the flag TPM_CHIP_FLAG_VIRTUAL, which |
| is only set for the tpm_vtpm_proxy driver. |
| |
| Cc: stable@vger.kernel.org |
| Fixes: 6f99612e2500 ("tpm: Proxy driver for supporting multiple emulated TPMs") |
| Signed-off-by: Stefan Berger <stefanb@linux.ibm.com> |
| Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org> |
| Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org> |
| Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| --- |
| drivers/char/tpm/eventlog/common.c | 3 +++ |
| 1 file changed, 3 insertions(+) |
| |
| --- a/drivers/char/tpm/eventlog/common.c |
| +++ b/drivers/char/tpm/eventlog/common.c |
| @@ -107,6 +107,9 @@ void tpm_bios_log_setup(struct tpm_chip |
| int log_version; |
| int rc = 0; |
| |
| + if (chip->flags & TPM_CHIP_FLAG_VIRTUAL) |
| + return; |
| + |
| rc = tpm_read_log(chip); |
| if (rc < 0) |
| return; |
