lkml.org 
[lkml]   [2009]   [Feb]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] TPM: integrity fix
Date
Fix to function which is called by IMA, now tpm_chip_find_get() considers the case in which the machine doesn't have a TPM or, if it has, its TPM isn't enabled.

Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Signed-off-by: Rajiv Andrade <srajiv@linux.vnet.ibm.com>
---
drivers/char/tpm/tpm.c | 8 +++++---
1 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c
index 0387965..912a473 100644
--- a/drivers/char/tpm/tpm.c
+++ b/drivers/char/tpm/tpm.c
@@ -666,18 +666,20 @@ EXPORT_SYMBOL_GPL(tpm_show_temp_deactivated);
*/
static struct tpm_chip *tpm_chip_find_get(int chip_num)
{
- struct tpm_chip *pos;
+ struct tpm_chip *pos, *chip = NULL;

rcu_read_lock();
list_for_each_entry_rcu(pos, &tpm_chip_list, list) {
if (chip_num != TPM_ANY_NUM && chip_num != pos->dev_num)
continue;

- if (try_module_get(pos->dev->driver->owner))
+ if (try_module_get(pos->dev->driver->owner)) {
+ chip = pos;
break;
+ }
}
rcu_read_unlock();
- return pos;
+ return chip;
}

#define TPM_ORDINAL_PCRREAD cpu_to_be32(21)
--
1.5.6.3


\
 
 \ /
  Last update: 2009-02-05 16:11    [W:1.267 / U:0.384 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site