From: Thorsten Blum <thorsten.blum@linux.dev>
To: "Mark Pearson" <mpearson-lenovo@squebb.ca>,
"Derek J. Clark" <derekjohn.clark@gmail.com>,
"Hans de Goede" <hansg@kernel.org>,
"Ilpo Järvinen" <ilpo.jarvinen@linux.intel.com>
Cc: Thorsten Blum <thorsten.blum@linux.dev>,
stable@vger.kernel.org, platform-driver-x86@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH] platform/x86: think-lmi: Free system certificate signatures
Date: Mon, 10 Aug 2026 22:41:07 +0200 [thread overview]
Message-ID: <20260810204106.165895-2-thorsten.blum@linux.dev> (raw)
Multi-certificate support also allows the system authentication object
to store ->signature and ->save_signature, which leak when the driver is
removed. Free the signatures to avoid leaking memory.
Fixes: 5dcb5ef12590 ("platform/x86: think-lmi: Multi-certificate support")
Cc: stable@vger.kernel.org
Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
---
drivers/platform/x86/lenovo/think-lmi.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/platform/x86/lenovo/think-lmi.c b/drivers/platform/x86/lenovo/think-lmi.c
index e215e86e3db7..e3e683bf3469 100644
--- a/drivers/platform/x86/lenovo/think-lmi.c
+++ b/drivers/platform/x86/lenovo/think-lmi.c
@@ -1456,6 +1456,10 @@ static void tlmi_release_attr(void)
/* Free up any saved signatures */
kfree(tlmi_priv.pwd_admin->signature);
kfree(tlmi_priv.pwd_admin->save_signature);
+ if (tlmi_priv.pwd_system) {
+ kfree(tlmi_priv.pwd_system->signature);
+ kfree(tlmi_priv.pwd_system->save_signature);
+ }
/* Authentication structures */
list_for_each_entry_safe(pos, n, &tlmi_priv.authentication_kset->list, entry)
reply other threads:[~2026-08-10 20:42 UTC|newest]
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