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tpm: vtpm_proxy: Avoid reading host log when using a virtual device 

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: 6f99612e25 ("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>
This commit is contained in:
Stefan Berger 2021-03-10 17:19:16 -05:00 committed by Greg Kroah-Hartman
parent 2f12258b52
commit 63a25b7156
1 changed files with 3 additions and 0 deletions
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3
drivers/char/tpm/eventlog/common.c
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@ -107,6 +107,9 @@ void tpm_bios_log_setup(struct tpm_chip *chip)
int log_version;
int rc = 0;
if (chip->flags & TPM_CHIP_FLAG_VIRTUAL)
return;
rc = tpm_read_log(chip);
if (rc < 0)
return;