* [PATCH] platform/x86: think-lmi: Free system certificate signatures
@ 2026-08-10 20:41 Thorsten Blum
0 siblings, 0 replies; only message in thread
From: Thorsten Blum @ 2026-08-10 20:41 UTC (permalink / raw)
To: Mark Pearson, Derek J. Clark, Hans de Goede, Ilpo Järvinen
Cc: Thorsten Blum, stable, platform-driver-x86, linux-kernel
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)
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2026-08-10 20:41 [PATCH] platform/x86: think-lmi: Free system certificate signatures Thorsten Blum
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