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Date: Wed, 24 Jun 2015 17:14:55 +0300 From: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com> To: peterhuewe@....de, tpmdd-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org Cc: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>, Marcel Selhorst <tpmdd@...horst.net>, Jason Gunthorpe <jgunthorpe@...idianresearch.com> Subject: [PATCH] tpm, tpm_crb: fail when TPM2 ACPI table contents look corrupted At least some versions of AMI BIOS have corrupted contents in the TPM2 ACPI table and namely the physical address of the control area is set to zero. This patch changes the driver to fail gracefully when we observe a zero address instead of continuing to ioremap. Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com> --- drivers/char/tpm/tpm_crb.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c index b26ceee..c8fae5b 100644 --- a/drivers/char/tpm/tpm_crb.c +++ b/drivers/char/tpm/tpm_crb.c @@ -233,6 +233,14 @@ static int crb_acpi_add(struct acpi_device *device) return -ENODEV; } + /* At least some versions of AMI BIOS have a bug that TPM2 table has + * zero address for the control area and therefore we must fail. + */ + if (!buf->control_area_pa) { + dev_err(dev, "TPM2 ACPI table has a zero address for the control area\n"); + return -EINVAL; + } + if (buf->hdr.length < sizeof(struct acpi_tpm2)) { dev_err(dev, "TPM2 ACPI table has wrong size"); return -EINVAL; -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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