linux-cve-announce - CVE-2022-50572: ASoC: audio-graph-card: fix refcount leak of cpu_ep in __graph_for_each

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Message-ID: <2025102208-CVE-2022-50572-dbfb@gregkh>
Date: Wed, 22 Oct 2025 15:24:20 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50572: ASoC: audio-graph-card: fix refcount leak of cpu_ep in __graph_for_each_link()

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

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

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

ASoC: audio-graph-card: fix refcount leak of cpu_ep in __graph_for_each_link()

The of_get_next_child() returns a node with refcount incremented, and
decrements the refcount of prev. So in the error path of the while loop,
of_node_put() needs be called for cpu_ep.

The Linux kernel CVE team has assigned CVE-2022-50572 to this issue.


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

	Issue introduced in 5.1 with commit fce9b90c1ab7e915553c57353355700c79b39c86 and fixed in 5.4.229 with commit ed1376f771404917c2ec3ebc617431ec01146134
	Issue introduced in 5.1 with commit fce9b90c1ab7e915553c57353355700c79b39c86 and fixed in 5.10.163 with commit 06c9d468c06806dab752eb8e72addbf3792c1023
	Issue introduced in 5.1 with commit fce9b90c1ab7e915553c57353355700c79b39c86 and fixed in 5.15.86 with commit 85eb5c952b7fe2d2059beaa4a4dd26688b25547b
	Issue introduced in 5.1 with commit fce9b90c1ab7e915553c57353355700c79b39c86 and fixed in 6.0.16 with commit 49dad92af6892f46851af989ef3aa7cd7316c389
	Issue introduced in 5.1 with commit fce9b90c1ab7e915553c57353355700c79b39c86 and fixed in 6.1.2 with commit 4cc8431ec77a43ea106d8bde0860c61cfdda1cd0
	Issue introduced in 5.1 with commit fce9b90c1ab7e915553c57353355700c79b39c86 and fixed in 6.2 with commit 8ab2d12c726f0fde0692fa5d81d8019b3dcd62d0

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-2022-50572
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:
	sound/soc/generic/audio-graph-card.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/ed1376f771404917c2ec3ebc617431ec01146134
	https://git.kernel.org/stable/c/06c9d468c06806dab752eb8e72addbf3792c1023
	https://git.kernel.org/stable/c/85eb5c952b7fe2d2059beaa4a4dd26688b25547b
	https://git.kernel.org/stable/c/49dad92af6892f46851af989ef3aa7cd7316c389
	https://git.kernel.org/stable/c/4cc8431ec77a43ea106d8bde0860c61cfdda1cd0
	https://git.kernel.org/stable/c/8ab2d12c726f0fde0692fa5d81d8019b3dcd62d0