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author | Jia Zhang <zhang.jia@linux.alibaba.com> | 2019-01-11 09:59:32 +0100 |
---|---|---|
committer | Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> | 2019-02-13 08:47:00 +0100 |
commit | bb3b6b0fc57182b568ded61c55eff8a02fcfe27b (patch) | |
tree | f05b6ecfd53614425b7bd3efc20f63f617f40e3a | |
parent | tpm/tpm_i2c_atmel: Return -E2BIG when the transfer is incomplete (diff) | |
download | linux-bb3b6b0fc57182b568ded61c55eff8a02fcfe27b.tar.xz linux-bb3b6b0fc57182b568ded61c55eff8a02fcfe27b.zip |
tpm: Simplify the measurements loop
The responsibility of tpm1_bios_measurements_start() is to walk over the
first *pos measurements, ensuring the skipped and to-be-read
measurements are not out-of-boundary.
This commit simplifies the loop by employing a do-while loop with
the necessary sanity check.
Signed-off-by: Jia Zhang <zhang.jia@linux.alibaba.com>
Reviewd-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
-rw-r--r-- | drivers/char/tpm/eventlog/tpm1.c | 37 |
1 files changed, 14 insertions, 23 deletions
diff --git a/drivers/char/tpm/eventlog/tpm1.c b/drivers/char/tpm/eventlog/tpm1.c index 58c84784ba25..4cf830333684 100644 --- a/drivers/char/tpm/eventlog/tpm1.c +++ b/drivers/char/tpm/eventlog/tpm1.c @@ -74,7 +74,7 @@ static const char* tcpa_pc_event_id_strings[] = { /* returns pointer to start of pos. entry of tcg log */ static void *tpm1_bios_measurements_start(struct seq_file *m, loff_t *pos) { - loff_t i; + loff_t i = 0; struct tpm_chip *chip = m->private; struct tpm_bios_log *log = &chip->log; void *addr = log->bios_event_log; @@ -83,38 +83,29 @@ static void *tpm1_bios_measurements_start(struct seq_file *m, loff_t *pos) u32 converted_event_size; u32 converted_event_type; - /* read over *pos measurements */ - for (i = 0; i < *pos; i++) { + do { event = addr; + /* check if current entry is valid */ + if (addr + sizeof(struct tcpa_event) >= limit) + return NULL; + converted_event_size = do_endian_conversion(event->event_size); converted_event_type = do_endian_conversion(event->event_type); - if ((addr + sizeof(struct tcpa_event)) < limit) { - if ((converted_event_type == 0) && - (converted_event_size == 0)) - return NULL; - addr += (sizeof(struct tcpa_event) + - converted_event_size); - } - } - - /* now check if current entry is valid */ - if ((addr + sizeof(struct tcpa_event)) >= limit) - return NULL; - - event = addr; + if (((converted_event_type == 0) && (converted_event_size == 0)) + || ((addr + sizeof(struct tcpa_event) + converted_event_size) + >= limit)) + return NULL; - converted_event_size = do_endian_conversion(event->event_size); - converted_event_type = do_endian_conversion(event->event_type); + if (i++ == *pos) + break; - if (((converted_event_type == 0) && (converted_event_size == 0)) - || ((addr + sizeof(struct tcpa_event) + converted_event_size) - >= limit)) - return NULL; + addr += (sizeof(struct tcpa_event) + converted_event_size); + } while (1); return addr; } |