tpm: fix byte-order for the value read by tpm2_get_tpm_pt

commit 1b0612b04090e416828c0dd5ed197b0913d834a0 upstream.

The result must be converted from BE byte order, which is used by the
TPM2 protocol. This has not popped out because tpm2_get_tpm_pt() has
been only used for probing.

Fixes: 7a1d7e6dd76a ("tpm: TPM 2.0 baseline support")
Change-Id: I7d71cd379b1a3b7659d20a1b6008216762596590
Signed-off-by: Andrey Pronin <apronin@chromium.org>
Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
index c12130485fc18e966c9e41736e57bd7fd0586082..678af51fb29e90eb077061c6aa03f0db212b3917 100644 (file)
--- a/drivers/char/tpm/tpm2-cmd.c
+++ b/drivers/char/tpm/tpm2-cmd.c
@@ -657,7 +657,7 @@ ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id,  u32 *value,
 
        rc = tpm_transmit_cmd(chip, &cmd, sizeof(cmd), desc);
        if (!rc)
-               *value = cmd.params.get_tpm_pt_out.value;
+               *value = be32_to_cpu(cmd.params.get_tpm_pt_out.value);
 
        return rc;
 }