linux-kernel - [PATCH AUTOSEL 6.4 39/54] platform/x86: think-lmi: Use kfree

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Message-Id: <20230813154934.1067569-39-sashal@kernel.org>
Date:   Sun, 13 Aug 2023 11:49:18 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Wang Ming <machel@...o.com>, Hans de Goede <hdegoede@...hat.com>,
        Sasha Levin <sashal@...nel.org>, markpearson@...ovo.com,
        markgross@...nel.org, platform-driver-x86@...r.kernel.org
Subject: [PATCH AUTOSEL 6.4 39/54] platform/x86: think-lmi: Use kfree_sensitive instead of kfree

From: Wang Ming <machel@...o.com>

[ 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@...o.com>
Link: https://lore.kernel.org/r/20230717101114.18966-1-machel@vivo.com
Reviewed-by: Hans de Goede <hdegoede@...hat.com>
Signed-off-by: Hans de Goede <hdegoede@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/platform/x86/think-lmi.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/platform/x86/think-lmi.c b/drivers/platform/x86/think-lmi.c
index e4047ee0a7546..63eca13fd882f 100644
--- 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;
 }
-- 
2.40.1