From 8920d5ad6ba74ae8ab020e90cc4d976980e68701 Mon Sep 17 00:00:00 2001 From: Rajiv Andrade Date: Thu, 5 Feb 2009 13:06:30 -0200 Subject: 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 Signed-off-by: Rajiv Andrade Acked-by: Serge Hallyn Signed-off-by: James Morris --- drivers/char/tpm/tpm.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) (limited to 'drivers/char') diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c index 62a5682578ca..ccdd828adcef 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) -- cgit v1.2.3