linux-cve-announce - CVE-2022-50157: PCI: microchip: Fix refcount leak in mc_pcie_init_irq

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Message-ID: <2025061824-CVE-2022-50157-14c2@gregkh>
Date: Wed, 18 Jun 2025 13:03:42 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50157: PCI: microchip: Fix refcount leak in mc_pcie_init_irq_domains()

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

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

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

PCI: microchip: Fix refcount leak in mc_pcie_init_irq_domains()

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

mc_pcie_init_irq_domains() only calls of_node_put() in the normal path,
missing it in some error paths.  Add missing of_node_put() to avoid
refcount leak.

The Linux kernel CVE team has assigned CVE-2022-50157 to this issue.


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

	Issue introduced in 5.12 with commit 6f15a9c9f94133bee0d861a4bf25e10aaa95219d and fixed in 5.15.61 with commit c0ad5c7e68d10f6f8ffb0f4329e3c19404fbca58
	Issue introduced in 5.12 with commit 6f15a9c9f94133bee0d861a4bf25e10aaa95219d and fixed in 5.18.18 with commit 6cd5f93b5c6a66c68a91dbc604a78207252ecd43
	Issue introduced in 5.12 with commit 6f15a9c9f94133bee0d861a4bf25e10aaa95219d and fixed in 5.19.2 with commit 880ece912b958a0c92cc0baa8e906fb9b49a4b53
	Issue introduced in 5.12 with commit 6f15a9c9f94133bee0d861a4bf25e10aaa95219d and fixed in 6.0 with commit f030304fdeb87ec8f1b518c73703214aec6cc24a

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-2022-50157
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-microchip-host.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/c0ad5c7e68d10f6f8ffb0f4329e3c19404fbca58
	https://git.kernel.org/stable/c/6cd5f93b5c6a66c68a91dbc604a78207252ecd43
	https://git.kernel.org/stable/c/880ece912b958a0c92cc0baa8e906fb9b49a4b53
	https://git.kernel.org/stable/c/f030304fdeb87ec8f1b518c73703214aec6cc24a