[PATCH 1/4] platform/x86: dell-privacy: Fix race condition

[Armin Wolf]

Accessing priv->features_present needs to happen with the list mutex
being held, otherwise priv can be freed at any moment.

Fixes: 8af9fa37b8a3 ("platform/x86: dell-privacy: Add support for Dell hardware privacy")
Signed-off-by: Armin Wolf <W_Armin@xxxxxx>
---
 drivers/platform/x86/dell/dell-wmi-privacy.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/platform/x86/dell/dell-wmi-privacy.c b/drivers/platform/x86/dell/dell-wmi-privacy.c
index f9d275b2f900..366e5b8dc868 100644
--- a/drivers/platform/x86/dell/dell-wmi-privacy.c
+++ b/drivers/platform/x86/dell/dell-wmi-privacy.c
@@ -92,11 +92,11 @@ bool dell_privacy_has_mic_mute(void)
 {
 	struct privacy_wmi_data *priv;
 
-	mutex_lock(&list_mutex);
+	guard(mutex)(&list_mutex);
+
 	priv = list_first_entry_or_null(&wmi_list,
 			struct privacy_wmi_data,
 			list);
-	mutex_unlock(&list_mutex);
 
 	return priv && (priv->features_present & BIT(DELL_PRIVACY_TYPE_AUDIO));
 }
-- 
2.39.5