[PATCH v3 1/8] HID: asus: mitigate possible use-after-free

[Denis Benato <denis.benato@linux.dev>]

The kbd_backlight pointer is not being set to NULL after being freed in
asus_kbd_register_leds and other portions of the driver checks that field,
therefore set the pointer to NULL after being freed.

Link: https://lore.kernel.org/all/20260612130125.AAAE71F000E9@smtp.kernel.org/

Suggested-by: sashiko-bot@kernel.org
Reviewed-by: Antheas Kapenekakis <lkml@antheas.dev>
Signed-off-by: Denis Benato <denis.benato@linux.dev>
---
 drivers/hid/hid-asus.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/hid/hid-asus.c b/drivers/hid/hid-asus.c
index d34d74df3dc0..4d7110b892bd 100644
--- a/drivers/hid/hid-asus.c
+++ b/drivers/hid/hid-asus.c
@@ -777,6 +777,7 @@ static int asus_kbd_register_leds(struct hid_device *hdev)
 	if (ret < 0) {
 		/* No need to have this still around */
 		devm_kfree(&hdev->dev, drvdata->kbd_backlight);
+		drvdata->kbd_backlight = NULL;
 	}
 
 	return ret;
-- 
2.47.3