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Message-Id: <1513887422-123222-1-git-send-email-azhar.shaikh@intel.com>
Date: Thu, 21 Dec 2017 12:17:02 -0800
From: Azhar Shaikh <azhar.shaikh@...el.com>
To: jarkko.sakkinen@...ux.intel.com, jgg@...pe.ca, javierm@...hat.com,
peterhuewe@....de
Cc: linux-security-module@...r.kernel.org,
linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
tpmdd-devel@...ts.sourceforge.net, azhar.shaikh@...el.com
Subject: [PATCH] tpm: Fix the driver cleanup code
Commit 3c1701339284353c41 ("tpm: Keep CLKRUN enabled throughout
the duration of transmit_cmd()") added code which accessed
chip->ops, even after it was set to NULL in tpm_del_char_device(),
called from tpm_chip_unregister() in error / driver exit paths.
So fix this code.
Fixes: 3c1701339284353c41 ("tpm: Keep CLKRUN enabled throughout
the duration of transmit_cmd()")
Suggested-by: Javier Martinez Canillas <javierm@...hat.com>
Suggested-by: Jason Gunthorpe <jgg@...pe.ca>
Signed-off-by: Azhar Shaikh <azhar.shaikh@...el.com>
---
drivers/char/tpm/tpm-chip.c | 5 +++++
drivers/char/tpm/tpm.h | 1 +
drivers/char/tpm/tpm_tis.c | 8 ++------
drivers/char/tpm/tpm_tis_core.c | 23 +++++++++++++++--------
drivers/char/tpm/tpm_tis_spi.c | 1 +
5 files changed, 24 insertions(+), 14 deletions(-)
diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
index 0a62c19937b6..c88ec9a32a7e 100644
--- a/drivers/char/tpm/tpm-chip.c
+++ b/drivers/char/tpm/tpm-chip.c
@@ -346,6 +346,10 @@ static void tpm_del_char_device(struct tpm_chip *chip)
down_write(&chip->ops_sem);
if (chip->flags & TPM_CHIP_FLAG_TPM2)
tpm2_shutdown(chip, TPM2_SU_CLEAR);
+ if (chip->flags & TPM_CHIP_FLAG_DO_NOT_CLEAR_OPS) {
+ up_write(&chip->ops_sem);
+ return;
+ }
chip->ops = NULL;
up_write(&chip->ops_sem);
}
@@ -454,6 +458,7 @@ int tpm_chip_register(struct tpm_chip *chip)
rc = tpm_add_legacy_sysfs(chip);
if (rc) {
+ chip->flags |= TPM_CHIP_FLAG_DO_NOT_CLEAR_OPS;
tpm_chip_unregister(chip);
return rc;
}
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index f895fba4e20d..dc2a532649e0 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -183,6 +183,7 @@ enum tpm_chip_flags {
TPM_CHIP_FLAG_VIRTUAL = BIT(3),
TPM_CHIP_FLAG_HAVE_TIMEOUTS = BIT(4),
TPM_CHIP_FLAG_ALWAYS_POWERED = BIT(5),
+ TPM_CHIP_FLAG_DO_NOT_CLEAR_OPS = BIT(6),
};
struct tpm_bios_log {
diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
index d29add49b033..a146ef4e499b 100644
--- a/drivers/char/tpm/tpm_tis.c
+++ b/drivers/char/tpm/tpm_tis.c
@@ -273,11 +273,9 @@ static void tpm_tis_pnp_remove(struct pnp_dev *dev)
struct tpm_chip *chip = pnp_get_drvdata(dev);
struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
+ chip->flags |= TPM_CHIP_FLAG_DO_NOT_CLEAR_OPS;
tpm_chip_unregister(chip);
tpm_tis_remove(chip);
- if (is_bsw())
- iounmap(priv->ilb_base_addr);
-
}
static struct pnp_driver tis_pnp_driver = {
@@ -326,12 +324,10 @@ static int tpm_tis_plat_remove(struct platform_device *pdev)
struct tpm_chip *chip = dev_get_drvdata(&pdev->dev);
struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
+ chip->flags |= TPM_CHIP_FLAG_DO_NOT_CLEAR_OPS;
tpm_chip_unregister(chip);
tpm_tis_remove(chip);
- if (is_bsw())
- iounmap(priv->ilb_base_addr);
-
return 0;
}
diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
index c2227983ed88..d9099281fc2e 100644
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -727,6 +727,14 @@ void tpm_tis_remove(struct tpm_chip *chip)
if (chip->ops->clk_enable != NULL)
chip->ops->clk_enable(chip, false);
+
+ if (chip->flags & TPM_CHIP_FLAG_DO_NOT_CLEAR_OPS) {
+ down_write(&chip->ops_sem);
+ chip->ops = NULL;
+ up_write(&chip->ops_sem);
+ }
+ if (priv->ilb_base_addr)
+ iounmap(priv->ilb_base_addr);
}
EXPORT_SYMBOL_GPL(tpm_tis_remove);
@@ -922,21 +930,20 @@ int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq,
}
rc = tpm_chip_register(chip);
- if (rc && is_bsw())
- iounmap(priv->ilb_base_addr);
+ if (rc)
+ goto out_err;
if (chip->ops->clk_enable != NULL)
chip->ops->clk_enable(chip, false);
- return rc;
-out_err:
- tpm_tis_remove(chip);
- if (is_bsw())
- iounmap(priv->ilb_base_addr);
+ return 0;
- if (chip->ops->clk_enable != NULL)
+out_err:
+ if ((chip->ops != NULL) && (chip->ops->clk_enable != NULL))
chip->ops->clk_enable(chip, false);
+ tpm_tis_remove(chip);
+
return rc;
}
EXPORT_SYMBOL_GPL(tpm_tis_core_init);
diff --git a/drivers/char/tpm/tpm_tis_spi.c b/drivers/char/tpm/tpm_tis_spi.c
index 424ff2fde1f2..79c18cfc6519 100644
--- a/drivers/char/tpm/tpm_tis_spi.c
+++ b/drivers/char/tpm/tpm_tis_spi.c
@@ -221,6 +221,7 @@ static int tpm_tis_spi_remove(struct spi_device *dev)
{
struct tpm_chip *chip = spi_get_drvdata(dev);
+ chip->flags |= TPM_CHIP_FLAG_DO_NOT_CLEAR_OPS;
tpm_chip_unregister(chip);
tpm_tis_remove(chip);
return 0;
--
1.9.1
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