usb: typec: tipd: fix uninitialized typec_partner_desc in tps6598x_connect()

Overview

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

usb: typec: tipd: fix uninitialized typec_partner_desc in tps6598x_connect()

tps6598x_connect() 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 >= 0a4c005bd1715d8b32a368ed5516a6ee7e603d18 < 4b6823ce0e548491cb9663303cba28e18d351096
• Linux >= 0a4c005bd1715d8b32a368ed5516a6ee7e603d18 < 282be6ae8be791762740107c79cecf5121f66063
• Linux >= 0a4c005bd1715d8b32a368ed5516a6ee7e603d18 < dac0c073c6ad5f1bbb5e9fea9023fc1b4dab5e14
• Linux >= 0a4c005bd1715d8b32a368ed5516a6ee7e603d18 < c4b27b3605788bbf9e4251f3cd4ab94645ab036f
• Linux 4.15

Remediation

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