HID: alps: unregister DualPoint Stick input device on remove

Overview

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

HID: alps: unregister DualPoint Stick input device on remove

alps_input_configured() allocates a second input device ("DualPoint Stick") with input_allocate_device() and registers it, but the alps_driver struct has no .remove handler and input2 is not tracked in hdev->inputs. The default remove path (hid_hw_stop -> hidinput_disconnect) only iterates hdev->inputs, so input2 is never unregistered and leaks on every device removal.

Add a .remove handler that stops the device first (preventing URB callbacks from touching input2 during teardown) and then unregisters input2.

Affected

• Linux >= 2562756dde550901c224e3805102bdfc17e7d13a < bd9571812d02242b6bba2637fba924a78a5c6fa8
• Linux >= 2562756dde550901c224e3805102bdfc17e7d13a < 1170ebfba562b3938ff7749b2e42e4420f19436d
• Linux >= 2562756dde550901c224e3805102bdfc17e7d13a < aa4845a710ae9fee6a3831f5c338904cea77c3aa
• Linux >= 2562756dde550901c224e3805102bdfc17e7d13a < 978e801750c7b0859e87eae619f7d88fcd88333e
• Linux >= 2562756dde550901c224e3805102bdfc17e7d13a < aa9dde93e05a837645fdfd577eea71f0733f0694
• Linux 4.8

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.