linux-cve-announce - CVE-2025-39771: regulator: pca9450: Use devm_register_sys_off

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Message-ID: <2025091146-CVE-2025-39771-2a74@gregkh>
Date: Thu, 11 Sep 2025 18:56:50 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-39771: regulator: pca9450: Use devm_register_sys_off_handler

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

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

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

regulator: pca9450: Use devm_register_sys_off_handler

With module test, there is error dump:
------------[ cut here ]------------
  notifier callback pca9450_i2c_restart_handler already registered
  WARNING: kernel/notifier.c:23 at notifier_chain_register+0x5c/0x88,
  CPU#0: kworker/u16:3/50
  Call trace:
  notifier_chain_register+0x5c/0x88 (P)
  atomic_notifier_chain_register+0x30/0x58
  register_restart_handler+0x1c/0x28
  pca9450_i2c_probe+0x418/0x538
  i2c_device_probe+0x220/0x3d0
  really_probe+0x114/0x410
  __driver_probe_device+0xa0/0x150
  driver_probe_device+0x40/0x114
  __device_attach_driver+0xd4/0x12c

So use devm_register_sys_off_handler to let kernel handle the resource
free to avoid kernel dump.

The Linux kernel CVE team has assigned CVE-2025-39771 to this issue.


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

	Issue introduced in 6.16 with commit 6157e62b07d9331cc1d4d9d525dab33d45b0e83c and fixed in 6.16.4 with commit 7a8c8aa0b0b2c62a0232bf868def85f3069ba7a7
	Issue introduced in 6.16 with commit 6157e62b07d9331cc1d4d9d525dab33d45b0e83c and fixed in 6.17-rc3 with commit 447be50598c05499f7ccc2b1f6ddb3da30f8099a

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-2025-39771
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/regulator/pca9450-regulator.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/7a8c8aa0b0b2c62a0232bf868def85f3069ba7a7
	https://git.kernel.org/stable/c/447be50598c05499f7ccc2b1f6ddb3da30f8099a