linux-cve-announce - CVE-2022-49749: i2c: designware: use casting of u64 in clock multiplication to avoid overflow

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Message-ID: <2025032759-CVE-2022-49749-ed85@gregkh>
Date: Thu, 27 Mar 2025 17:43:07 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2022-49749: i2c: designware: use casting of u64 in clock multiplication to avoid overflow

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

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

i2c: designware: use casting of u64 in clock multiplication to avoid overflow

In functions i2c_dw_scl_lcnt() and i2c_dw_scl_hcnt() may have overflow
by depending on the values of the given parameters including the ic_clk.
For example in our use case where ic_clk is larger than one million,
multiplication of ic_clk * 4700 will result in 32 bit overflow.

Add cast of u64 to the calculation to avoid multiplication overflow, and
use the corresponding define for divide.

The Linux kernel CVE team has assigned CVE-2022-49749 to this issue.


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

	Issue introduced in 3.2 with commit 2373f6b9744d5373b886f3ce1a985193cca0a356 and fixed in 5.10.166 with commit ed173f77fd28a3e4fffc13b3f28687b9eba61157
	Issue introduced in 3.2 with commit 2373f6b9744d5373b886f3ce1a985193cca0a356 and fixed in 5.15.91 with commit 2f29d780bd691d20e89e5b35d5e6568607115e94
	Issue introduced in 3.2 with commit 2373f6b9744d5373b886f3ce1a985193cca0a356 and fixed in 6.1.9 with commit 9f36aae9e80e79b7a6d62227eaa96935166be9fe
	Issue introduced in 3.2 with commit 2373f6b9744d5373b886f3ce1a985193cca0a356 and fixed in 6.2 with commit c8c37bc514514999e62a17e95160ed9ebf75ca8d

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-2022-49749
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/i2c/busses/i2c-designware-common.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/ed173f77fd28a3e4fffc13b3f28687b9eba61157
	https://git.kernel.org/stable/c/2f29d780bd691d20e89e5b35d5e6568607115e94
	https://git.kernel.org/stable/c/9f36aae9e80e79b7a6d62227eaa96935166be9fe
	https://git.kernel.org/stable/c/c8c37bc514514999e62a17e95160ed9ebf75ca8d