usb: typec: ucsi: glink: fix use-after-free of ucsi on remove

Overview

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

usb: typec: ucsi: glink: fix use-after-free of ucsi on remove

The pmic_glink client is released by the devres cleanup, which runs after pmic_glink_ucsi_remove() has returned, so its notification callbacks can queue work until then. Work that runs after ucsi_unregister() has been called touches freed state: it dereferences the connector array that ucsi_unregister() freed, or registers and unregisters the instance a second time.

Disable both work items with disable_work_sync() before unregistering, and unregister only if the instance is still registered.

This issue was found by an in-house static analysis tool.

Affected

• Linux >= 62b5412b1f4afab27d8df90ddcabb8e1e11a00ad < 432b58cd959e594909a581b4974396cdbc9d4ca1
• Linux >= 62b5412b1f4afab27d8df90ddcabb8e1e11a00ad < 41934f92e7a54d4080ac0b17aacc83224946785c
• Linux >= 62b5412b1f4afab27d8df90ddcabb8e1e11a00ad < ee8577de01c6b6c7dd1d76b52242c54d37a989f4
• Linux >= 62b5412b1f4afab27d8df90ddcabb8e1e11a00ad < 63b269ec537dc0fd26d0bd64872c26860d108c9d
• Linux 6.4

Remediation

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