diff mbox series

[v2,2/2] media: rc: do not access device via sysfs after rc_unregister_device()

Message ID 20200808203352.9793-2-sean@mess.org (mailing list archive)
State New, archived
Headers show
Series [v2,1/2] media: rc: uevent sysfs file races with rc_register_device() | expand

Commit Message

Sean Young Aug. 8, 2020, 8:33 p.m. UTC 
Device drivers do not expect to have change_protocol or wakeup
re-programming to be accesed after rc_unregister_device(). This can
cause the device driver to access deallocated resources.

Cc: <stable@vger.kernel.org> # 4.16
Signed-off-by: Sean Young <sean@mess.org>
---
 drivers/media/rc/rc-main.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)
diff mbox series

Patch

diff --git a/drivers/media/rc/rc-main.c b/drivers/media/rc/rc-main.c
index e1cda80a4b25..dee8a9f3d80a 100644
--- a/drivers/media/rc/rc-main.c
+++ b/drivers/media/rc/rc-main.c
@@ -1292,6 +1292,10 @@  static ssize_t store_protocols(struct device *device,
 	}
 
 	mutex_lock(&dev->lock);
+	if (!dev->registered) {
+		mutex_unlock(&dev->lock);
+		return -ENODEV;
+	}
 
 	old_protocols = *current_protocols;
 	new_protocols = old_protocols;
@@ -1430,6 +1434,10 @@  static ssize_t store_filter(struct device *device,
 		return -EINVAL;
 
 	mutex_lock(&dev->lock);
+	if (!dev->registered) {
+		mutex_unlock(&dev->lock);
+		return -ENODEV;
+	}
 
 	new_filter = *filter;
 	if (fattr->mask)
@@ -1544,6 +1552,10 @@  static ssize_t store_wakeup_protocols(struct device *device,
 	int i;
 
 	mutex_lock(&dev->lock);
+	if (!dev->registered) {
+		mutex_unlock(&dev->lock);
+		return -ENODEV;
+	}
 
 	allowed = dev->allowed_wakeup_protocols;