usb: typec: tipd: fix uninitialized typec_partner_desc in cd321x_update_work()

Overview

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

usb: typec: tipd: fix uninitialized typec_partner_desc in cd321x_update_work()

cd321x_update_work() passes a stack-allocated typec_partner_desc to typec_register_partner() after initializing only usb_pd, accessory and identity.

typec_register_partner() copies attach and deattach from the descriptor into the partner. With those fields left unset, garbage function pointers may be stored and later invoked from typec_partner_link_device() when a USB device is linked to the port. Uninitialized pd_revision and usb_capability similarly leak stack data through partner sysfs.

Zero-initialize the descriptor so optional callbacks remain NULL and the remaining fields are zero.

Affected

• Linux >= 82432bbfb9e83b7e81d04660fe129b99a29b2ac2 < 75dc6cb377efd2f4428b7f76d3a590a0bbc10399
• Linux >= 82432bbfb9e83b7e81d04660fe129b99a29b2ac2 < 5414144e202a32437e3eb436cd3f5f00d79ad86e
• Linux >= 82432bbfb9e83b7e81d04660fe129b99a29b2ac2 < 88c7e458af53ff781a3f1051708395892b325576
• Linux 6.18

Remediation

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