linux-cve-announce - CVE-2025-40156: PM / devfreq: mtk-cci: Fix potential error pointer dereference in probe()

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Message-ID: <2025111258-CVE-2025-40156-3045@gregkh>
Date: Wed, 12 Nov 2025 19:24:32 +0900
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-40156: PM / devfreq: mtk-cci: Fix potential error pointer dereference in probe()

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

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

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

PM / devfreq: mtk-cci: Fix potential error pointer dereference in probe()

The drv->sram_reg pointer could be set to ERR_PTR(-EPROBE_DEFER) which
would lead to a error pointer dereference.  Use IS_ERR_OR_NULL() to check
that the pointer is valid.

The Linux kernel CVE team has assigned CVE-2025-40156 to this issue.


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

	Issue introduced in 6.1 with commit e09bd5757b5227d6804b30c58d4587f7f87d1afa and fixed in 6.1.156 with commit 9cc23e221f392304b7b8aad213812564ddf6517e
	Issue introduced in 6.1 with commit e09bd5757b5227d6804b30c58d4587f7f87d1afa and fixed in 6.6.112 with commit 80eab6a9df7e1107dc334434dbacd05297703377
	Issue introduced in 6.1 with commit e09bd5757b5227d6804b30c58d4587f7f87d1afa and fixed in 6.12.53 with commit 44e32104cf7e670e3d683c97b52350d8fac23322
	Issue introduced in 6.1 with commit e09bd5757b5227d6804b30c58d4587f7f87d1afa and fixed in 6.17.3 with commit 24d61b6e23d2c7291c528dd43a0bf76b5c05c8f0
	Issue introduced in 6.1 with commit e09bd5757b5227d6804b30c58d4587f7f87d1afa and fixed in 6.18-rc1 with commit fc33bf0e097c6834646b98a7b3da0ae5b617f0f9

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-2025-40156
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/devfreq/mtk-cci-devfreq.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/9cc23e221f392304b7b8aad213812564ddf6517e
	https://git.kernel.org/stable/c/80eab6a9df7e1107dc334434dbacd05297703377
	https://git.kernel.org/stable/c/44e32104cf7e670e3d683c97b52350d8fac23322
	https://git.kernel.org/stable/c/24d61b6e23d2c7291c528dd43a0bf76b5c05c8f0
	https://git.kernel.org/stable/c/fc33bf0e097c6834646b98a7b3da0ae5b617f0f9