linux-cve-announce - CVE-2022-50468: platform/chrome: cros_usbpd_notify: Fix error handling in cros_usbpd_notify

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Message-ID: <2025100122-CVE-2022-50468-3196@gregkh>
Date: Wed,  1 Oct 2025 13:45:38 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50468: platform/chrome: cros_usbpd_notify: Fix error handling in cros_usbpd_notify_init()

From: Greg Kroah-Hartman <gregkh@...nel.org>

Description
===========

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

platform/chrome: cros_usbpd_notify: Fix error handling in cros_usbpd_notify_init()

The following WARNING message was given when rmmod cros_usbpd_notify:

 Unexpected driver unregister!
 WARNING: CPU: 0 PID: 253 at drivers/base/driver.c:270 driver_unregister+0x8a/0xb0
 Modules linked in: cros_usbpd_notify(-)
 CPU: 0 PID: 253 Comm: rmmod Not tainted 6.1.0-rc3 #24
 ...
 Call Trace:
  <TASK>
  cros_usbpd_notify_exit+0x11/0x1e [cros_usbpd_notify]
  __x64_sys_delete_module+0x3c7/0x570
  ? __ia32_sys_delete_module+0x570/0x570
  ? lock_is_held_type+0xe3/0x140
  ? syscall_enter_from_user_mode+0x17/0x50
  ? rcu_read_lock_sched_held+0xa0/0xd0
  ? syscall_enter_from_user_mode+0x1c/0x50
  do_syscall_64+0x37/0x90
  entry_SYSCALL_64_after_hwframe+0x63/0xcd
 RIP: 0033:0x7f333fe9b1b7

The reason is that the cros_usbpd_notify_init() does not check the return
value of platform_driver_register(), and the cros_usbpd_notify can
install successfully even if platform_driver_register() failed.

Fix by checking the return value of platform_driver_register() and
unregister cros_usbpd_notify_plat_driver when it failed.

The Linux kernel CVE team has assigned CVE-2022-50468 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 5.7 with commit ec2daf6e33f9f9113ba085b6ff88592907b6f1ce and fixed in 5.10.163 with commit 5c0cacdd354987f8f5348d16908716f154047890
	Issue introduced in 5.7 with commit ec2daf6e33f9f9113ba085b6ff88592907b6f1ce and fixed in 5.15.86 with commit cab345f9d51943898e406275f9607c145adb1877
	Issue introduced in 5.7 with commit ec2daf6e33f9f9113ba085b6ff88592907b6f1ce and fixed in 6.0.16 with commit 7b6ee54995739202b4a0cc01b7e9269f761c573d
	Issue introduced in 5.7 with commit ec2daf6e33f9f9113ba085b6ff88592907b6f1ce and fixed in 6.1.2 with commit 751f12696d797e785d2611099fe9f0569d47556e
	Issue introduced in 5.7 with commit ec2daf6e33f9f9113ba085b6ff88592907b6f1ce and fixed in 6.2 with commit 5a2d96623670155d94aca72c320c0ac27bdc6bd2

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2022-50468
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	drivers/platform/chrome/cros_usbpd_notify.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/5c0cacdd354987f8f5348d16908716f154047890
	https://git.kernel.org/stable/c/cab345f9d51943898e406275f9607c145adb1877
	https://git.kernel.org/stable/c/7b6ee54995739202b4a0cc01b7e9269f761c573d
	https://git.kernel.org/stable/c/751f12696d797e785d2611099fe9f0569d47556e
	https://git.kernel.org/stable/c/5a2d96623670155d94aca72c320c0ac27bdc6bd2