AZL-93776

In the Linux kernel, the following vulnerability has been resolved:

HID: lg-g15: cancel pending work on remove to fix a use-after-free

lgg15data is allocated with devm and holds a work item. The report handlers schedule that work straight from device input. lgg15event() and lgg15v2event() do it on the backlight cycle key, and lgg510ledsevent() does it too. The worker dereferences the lgg15data back through container_of.

The driver had no remove callback and never cancelled the work. So if a report scheduled the work and the keyboard was then unplugged, devres freed lgg15data while the work was still pending or running, and the worker touched freed memory. This is a use-after-free. It is reachable as a race on device unplug.

Add a remove callback that cancels the work before devres frees the state. g15->work is only initialized for the models that schedule it (G15, G15 v2, G510). The G13 and Z-10 leave it zeroed, so guard the cancel on g15->work.func to avoid cancelling a work that was never set up. The g15 NULL test mirrors the one already in lgg15raw_event().