Vulnerability CVE-2024-36893
Published: 2024-05-30

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

usb: typec: tcpm: Check for port partner validity before consuming it

typec_register_partner() does not guarantee partner registration
to always succeed. In the event of failure, port->partner is set
to the error value or NULL. Given that port->partner validity is
not checked, this results in the following crash:

Unable to handle kernel NULL pointer dereference at virtual address xx
pc : run_state_machine+0x1bc8/0x1c08
lr : run_state_machine+0x1b90/0x1c08
..
Call trace:
run_state_machine+0x1bc8/0x1c08
tcpm_state_machine_work+0x94/0xe4
kthread_worker_fn+0x118/0x328
kthread+0x1d0/0x23c
ret_from_fork+0x10/0x20

To prevent the crash, check for port->partner validity before
derefencing it in all the call sites.

 References:
https://git.kernel.org/stable/c/d56d2ca03cc22123fd7626967d096d8661324e57
https://git.kernel.org/stable/c/789326cafbd1f67f424436b6bc8bdb887a364637
https://git.kernel.org/stable/c/fc2b655cb6dd2b381f1f284989721002e39b6b77
https://git.kernel.org/stable/c/ae11f04b452b5205536e1c02d31f8045eba249dd
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