CVE-2026-89887

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

media: i2c: ov7740: fix use-after-destroy in remove

The ov7740_remove() function had a severe teardown order bug where it

destroyed the driver's mutex before freeing the V4L2 control handler

which relies on that mutex, leading to a use-after-destroy kernel panic.

Furthermore, the driver explicitly called v4l2_ctrl_handler_free() and

mutex_destroy() sequentially, but then called ov7740_free_controls()

which invokes both of them a second time, resulting in a double-free.

This patch fixes the issue by unregistering the subdevice first, and

relying exclusively on ov7740_free_controls() to safely tear down the

mutex and control handler in the correct order.