linux-cve-announce - CVE-2025-21870: ASoC: SOF: ipc4-topology: Harden loops for looking up ALH copiers

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Message-ID: <2025032735-CVE-2025-21870-4c78@gregkh>
Date: Thu, 27 Mar 2025 14:38:36 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2025-21870: ASoC: SOF: ipc4-topology: Harden loops for looking up ALH copiers

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

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

ASoC: SOF: ipc4-topology: Harden loops for looking up ALH copiers

Other, non DAI copier widgets could have the same  stream name (sname) as
the ALH copier and in that case the copier->data is NULL, no alh_data is
attached, which could lead to NULL pointer dereference.
We could check for this NULL pointer in sof_ipc4_prepare_copier_module()
and avoid the crash, but a similar loop in sof_ipc4_widget_setup_comp_dai()
will miscalculate the ALH device count, causing broken audio.

The correct fix is to harden the matching logic by making sure that the
1. widget is a DAI widget - so dai = w->private is valid
2. the dai (and thus the copier) is ALH copier

The Linux kernel CVE team has assigned CVE-2025-21870 to this issue.


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

	Issue introduced in 6.0 with commit a150345aa758492e05d2934f318ce7c2566b1cfe and fixed in 6.12.17 with commit 87c8768a96092ce75cd47fe076db5080db7ac515
	Issue introduced in 6.0 with commit a150345aa758492e05d2934f318ce7c2566b1cfe and fixed in 6.13.5 with commit 93c6c2e5801aab09ef1ef99f248f3cd323c3f152
	Issue introduced in 6.0 with commit a150345aa758492e05d2934f318ce7c2566b1cfe and fixed in 6.14 with commit 6fd60136d256b3b948333ebdb3835f41a95ab7ef

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-2025-21870
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/sof/ipc4-topology.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/87c8768a96092ce75cd47fe076db5080db7ac515
	https://git.kernel.org/stable/c/93c6c2e5801aab09ef1ef99f248f3cd323c3f152
	https://git.kernel.org/stable/c/6fd60136d256b3b948333ebdb3835f41a95ab7ef