platform/x86: think-lmi: Use kfree_sensitive instead of kfree

[ Upstream commit 1da0893aed2e48e2bdf37c29b029f2e060d25927 ]

key might contain private part of the key, so better use
kfree_sensitive to free it.

Signed-off-by: Wang Ming <machel@vivo.com>
Link: https://lore.kernel.org/r/20230717101114.18966-1-machel@vivo.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/platform/x86/think-lmi.c b/drivers/platform/x86/think-lmi.c
index e4047ee0a7546c43f72e7cca76ed91f90d96981d..63eca13fd882f7fcfcb57e7b7a576567427b7ea9 100644 (file)
--- a/drivers/platform/x86/think-lmi.c
+++ b/drivers/platform/x86/think-lmi.c
@@ -719,12 +719,12 @@ static ssize_t cert_to_password_store(struct kobject *kobj,
        /* Format: 'Password,Signature' */
        auth_str = kasprintf(GFP_KERNEL, "%s,%s", passwd, setting->signature);
        if (!auth_str) {
-               kfree(passwd);
+               kfree_sensitive(passwd);
                return -ENOMEM;
        }
        ret = tlmi_simple_call(LENOVO_CERT_TO_PASSWORD_GUID, auth_str);
        kfree(auth_str);
-       kfree(passwd);
+       kfree_sensitive(passwd);
 
        return ret ?: count;
 }