It's incorrect to assume that buffers returned by the TPM 10 bytes long are always error reports. This patches parses the error field in its header instead. The error report is now being printed using dev_err() instead of dev_dbg(), making it easier for users to provide more detailed bug reports.
Signed-off-by: Rajiv Andrade <[email protected]> Signed-off-by: Rajiv Andrade <[email protected]> (cherry picked from commit b9e3238aa36db33aa0d0bd44ef85297c45627aac) --- drivers/char/tpm/tpm.c | 15 ++++++++------- drivers/char/tpm/tpm.h | 2 +- drivers/char/tpm/tpm_tis.c | 2 -- 3 files changed, 9 insertions(+), 10 deletions(-) diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c index 50f20b7..1f7246b 100644 --- a/drivers/char/tpm/tpm.c +++ b/drivers/char/tpm/tpm.c @@ -440,7 +440,6 @@ out: } #define TPM_DIGEST_SIZE 20 -#define TPM_ERROR_SIZE 10 #define TPM_RET_CODE_IDX 6 enum tpm_capabilities { @@ -469,12 +468,14 @@ static ssize_t transmit_cmd(struct tpm_chip *chip, struct tpm_cmd_t *cmd, len = tpm_transmit(chip,(u8 *) cmd, len); if (len < 0) return len; - if (len == TPM_ERROR_SIZE) { - err = be32_to_cpu(cmd->header.out.return_code); - dev_dbg(chip->dev, "A TPM error (%d) occurred %s\n", err, desc); - return err; - } - return 0; + else if (len < TPM_HEADER_SIZE) + return -EFAULT; + + err = be32_to_cpu(cmd->header.out.return_code); + if (err != 0) + dev_err(chip->dev, "A TPM error (%d) occurred %s\n", err, desc); + + return err; } #define TPM_INTERNAL_RESULT_SIZE 200 diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h index e264de1..acda196 100644 --- a/drivers/char/tpm/tpm.h +++ b/drivers/char/tpm/tpm.h @@ -39,7 +39,7 @@ enum tpm_addr { }; #define TPM_WARN_DOING_SELFTEST 0x802 - +#define TPM_HEADER_SIZE 10 extern ssize_t tpm_show_pubek(struct device *, struct device_attribute *attr, char *); extern ssize_t tpm_show_pcrs(struct device *, struct device_attribute *attr, diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c index d93bafd..c5700fe 100644 --- a/drivers/char/tpm/tpm_tis.c +++ b/drivers/char/tpm/tpm_tis.c @@ -29,8 +29,6 @@ #include <linux/freezer.h> #include "tpm.h" -#define TPM_HEADER_SIZE 10 - enum tis_access { TPM_ACCESS_VALID = 0x80, TPM_ACCESS_ACTIVE_LOCALITY = 0x20, -- 1.7.3.4 -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
