From: Wang Ming <machel@vivo.com>
Date: Mon, 17 Jul 2023 10:11:02 +0000 (+0800)
Subject: platform/x86: think-lmi: Use kfree_sensitive instead of kfree
X-Git-Tag: v6.4.16~695
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8135100ab935f432e8e0108c0ee34333cf6eafc4;p=thirdparty%2Fkernel%2Fstable.git

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 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;
 }