linux-cve-announce - CVE-2022-50154: PCI: mediatek-gen3: Fix refcount leak in mtk_pcie_init_irq

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Message-ID: <2025061823-CVE-2022-50154-0e68@gregkh>
Date: Wed, 18 Jun 2025 13:03:39 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50154: PCI: mediatek-gen3: Fix refcount leak in mtk_pcie_init_irq_domains()

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

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

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

PCI: mediatek-gen3: Fix refcount leak in mtk_pcie_init_irq_domains()

of_get_child_by_name() returns a node pointer with refcount incremented, so
we should use of_node_put() on it when we don't need it anymore.

Add missing of_node_put() to avoid refcount leak.

The Linux kernel CVE team has assigned CVE-2022-50154 to this issue.


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

	Issue introduced in 5.13 with commit 814cceebba9b7d1306b8d49587ffb0e81f7b73af and fixed in 5.15.61 with commit 0675fe20da7fa69b1ba80c23470c1433a2356c03
	Issue introduced in 5.13 with commit 814cceebba9b7d1306b8d49587ffb0e81f7b73af and fixed in 5.18.18 with commit 2aa166c39d5a8221e6e22ab1a583656d4c8dc7f7
	Issue introduced in 5.13 with commit 814cceebba9b7d1306b8d49587ffb0e81f7b73af and fixed in 5.19.2 with commit e593e22786edd9eca058cf054d6a2e12c138da67
	Issue introduced in 5.13 with commit 814cceebba9b7d1306b8d49587ffb0e81f7b73af and fixed in 6.0 with commit bf038503d5fe90189743124233fe7aeb0984e961

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-2022-50154
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/pci/controller/pcie-mediatek-gen3.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/0675fe20da7fa69b1ba80c23470c1433a2356c03
	https://git.kernel.org/stable/c/2aa166c39d5a8221e6e22ab1a583656d4c8dc7f7
	https://git.kernel.org/stable/c/e593e22786edd9eca058cf054d6a2e12c138da67
	https://git.kernel.org/stable/c/bf038503d5fe90189743124233fe7aeb0984e961