linux-kernel - [PATCH] TPM: integrity fix

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Message-Id: <1233846390-21146-1-git-send-email-srajiv@linux.vnet.ibm.com>
Date:	Thu,  5 Feb 2009 13:06:30 -0200
From:	Rajiv Andrade <srajiv@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	jmorris@...ei.org, akpm@...ux-foundation.org, serue@...ibm.com,
	safford@...son.ibm.com, Mimi Zohar <zohar@...ux.vnet.ibm.com>
Subject: [PATCH] TPM: integrity fix

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@...ux.vnet.ibm.com>
Signed-off-by: Rajiv Andrade <srajiv@...ux.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

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