From: Tomas Winkler <tomas.winkler@intel.com>
To: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
Jason Gunthorpe <jgg@ziepe.ca>
Cc: Nayna Jain <nayna@linux.vnet.ibm.com>,
Alexander Usyskin <alexander.usyskin@intel.com>,
Tadeusz Struk <tadeusz.struk@intel.com>,
linux-integrity@vger.kernel.org,
linux-security-module@vger.kernel.org,
linux-kernel@vger.kernel.org,
Tomas Winkler <tomas.winkler@intel.com>,
stable@vger.kernel.org
Subject: [PATCH] tpm: tpm_try_transmit() refactor error flow.
Date: Tue, 16 Oct 2018 16:37:16 +0300 [thread overview]
Message-ID: <20181016133716.17842-1-tomas.winkler@intel.com> (raw)
First, rename out_no_locality to out_locality for bailing out on
both tpm_cmd_ready() and tpm_request_locality() failure.
Second, ignore the return value of go_to_idle() as it may override
the return value of the actual tpm operation, the go_to_idle() error
will be caught on any consequent command.
Last, fix the wrong 'goto out', that jumped back instead of forward.
Cc: stable@vger.kernel.org
Fixes: 627448e85c76 ("tpm: separate cmd_ready/go_idle from runtime_pm")
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
---
drivers/char/tpm/tpm-interface.c | 15 ++++++++-------
1 file changed, 8 insertions(+), 7 deletions(-)
diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index 129f640424b7..95db630dd722 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -477,13 +477,15 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip,
if (need_locality) {
rc = tpm_request_locality(chip, flags);
- if (rc < 0)
- goto out_no_locality;
+ if (rc < 0) {
+ need_locality = false;
+ goto out_locality;
+ }
}
rc = tpm_cmd_ready(chip, flags);
if (rc)
- goto out;
+ goto out_locality;
rc = tpm2_prepare_space(chip, space, ordinal, buf);
if (rc)
@@ -547,14 +549,13 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip,
dev_err(&chip->dev, "tpm2_commit_space: error %d\n", rc);
out:
- rc = tpm_go_idle(chip, flags);
- if (rc)
- goto out;
+ /* may fail but do not override previous error value in rc */
+ tpm_go_idle(chip, flags);
+out_locality:
if (need_locality)
tpm_relinquish_locality(chip, flags);
-out_no_locality:
if (chip->ops->clk_enable != NULL)
chip->ops->clk_enable(chip, false);
--
2.14.4
next reply other threads:[~2018-10-16 13:41 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-16 13:37 Tomas Winkler [this message]
2018-10-18 0:14 ` [PATCH] tpm: tpm_try_transmit() refactor error flow Jarkko Sakkinen
2018-10-18 6:06 ` Winkler, Tomas
2018-10-19 23:34 ` Jarkko Sakkinen
2018-10-20 22:49 ` Winkler, Tomas
2018-10-23 13:27 ` Jarkko Sakkinen
2018-10-23 14:16 ` Winkler, Tomas
2018-10-24 8:59 ` Jarkko Sakkinen
2018-10-24 9:01 ` Winkler, Tomas
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