Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755414AbdLUURH (ORCPT ); Thu, 21 Dec 2017 15:17:07 -0500 Received: from mga01.intel.com ([192.55.52.88]:33323 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752601AbdLUURD (ORCPT ); Thu, 21 Dec 2017 15:17:03 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.45,437,1508828400"; d="scan'208";a="4264422" From: Azhar Shaikh To: jarkko.sakkinen@linux.intel.com, jgg@ziepe.ca, javierm@redhat.com, peterhuewe@gmx.de Cc: linux-security-module@vger.kernel.org, linux-integrity@vger.kernel.org, linux-kernel@vger.kernel.org, tpmdd-devel@lists.sourceforge.net, azhar.shaikh@intel.com Subject: [PATCH] tpm: Fix the driver cleanup code Date: Thu, 21 Dec 2017 12:17:02 -0800 Message-Id: <1513887422-123222-1-git-send-email-azhar.shaikh@intel.com> X-Mailer: git-send-email 1.9.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4526 Lines: 148 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 Suggested-by: Jason Gunthorpe Signed-off-by: Azhar Shaikh --- 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