linux-cve-announce - CVE-2024-50205: ALSA: firewire-lib: Avoid division by zero in apply_constraint_to

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Message-ID: <2024110805-CVE-2024-50205-e583@gregkh>
Date: Fri,  8 Nov 2024 07:08:06 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-50205: ALSA: firewire-lib: Avoid division by zero in apply_constraint_to_size()

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

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

ALSA: firewire-lib: Avoid division by zero in apply_constraint_to_size()

The step variable is initialized to zero. It is changed in the loop,
but if it's not changed it will remain zero. Add a variable check
before the division.

The observed behavior was introduced by commit 826b5de90c0b
("ALSA: firewire-lib: fix insufficient PCM rule for period/buffer size"),
and it is difficult to show that any of the interval parameters will
satisfy the snd_interval_test() condition with data from the
amdtp_rate_table[] table.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

The Linux kernel CVE team has assigned CVE-2024-50205 to this issue.


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

	Issue introduced in 4.20 with commit 826b5de90c0b and fixed in 5.15.170 with commit 7d4eb9e22131
	Issue introduced in 4.20 with commit 826b5de90c0b and fixed in 6.1.115 with commit d2826873db70
	Issue introduced in 4.20 with commit 826b5de90c0b and fixed in 6.6.59 with commit 4bdc21506f12
	Issue introduced in 4.20 with commit 826b5de90c0b and fixed in 6.11.6 with commit 3452d39c4704
	Issue introduced in 4.20 with commit 826b5de90c0b and fixed in 6.12-rc5 with commit 72cafe63b35d

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-2024-50205
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/firewire/amdtp-stream.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/7d4eb9e22131ec154e638cbd56629195c9bcbe9a
	https://git.kernel.org/stable/c/d2826873db70a6719cdd9212a6739f3e6234cfc4
	https://git.kernel.org/stable/c/4bdc21506f12b2d432b1f2667e5ff4c75eee58e3
	https://git.kernel.org/stable/c/3452d39c4704aa12504e4190298c721fb01083c3
	https://git.kernel.org/stable/c/72cafe63b35d06b5cfbaf807e90ae657907858da