linux-cve-announce - CVE-2022-49208: RDMA/irdma: Prevent some integer underflows

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Message-ID: <2025022619-CVE-2022-49208-9293@gregkh>
Date: Wed, 26 Feb 2025 02:56:53 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2022-49208: RDMA/irdma: Prevent some integer underflows

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

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

RDMA/irdma: Prevent some integer underflows

My static checker complains that:

    drivers/infiniband/hw/irdma/ctrl.c:3605 irdma_sc_ceq_init()
    warn: can subtract underflow 'info->dev->hmc_fpm_misc.max_ceqs'?

It appears that "info->dev->hmc_fpm_misc.max_ceqs" comes from the firmware
in irdma_sc_parse_fpm_query_buf() so, yes, there is a chance that it could
be zero.  Even if we trust the firmware, it's easy enough to change the
condition just as a hardenning measure.

The Linux kernel CVE team has assigned CVE-2022-49208 to this issue.


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

	Issue introduced in 5.14 with commit 3f49d684256963d3f27dfb9d9ff228e2255be78d and fixed in 5.15.33 with commit d52dab6e03550f9c97121b0c11c0a3ed78ee76a4
	Issue introduced in 5.14 with commit 3f49d684256963d3f27dfb9d9ff228e2255be78d and fixed in 5.16.19 with commit f21056f15bbeacab7b4b87af232f5599d1f2bff1
	Issue introduced in 5.14 with commit 3f49d684256963d3f27dfb9d9ff228e2255be78d and fixed in 5.17.2 with commit 7340c3675d7ac946f4019b84cd7c64ed542dfe4c
	Issue introduced in 5.14 with commit 3f49d684256963d3f27dfb9d9ff228e2255be78d and fixed in 5.18 with commit 6f6dbb819dfc1a35bcb8b709b5c83a3ea8beff75

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-2022-49208
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/infiniband/hw/irdma/ctrl.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/d52dab6e03550f9c97121b0c11c0a3ed78ee76a4
	https://git.kernel.org/stable/c/f21056f15bbeacab7b4b87af232f5599d1f2bff1
	https://git.kernel.org/stable/c/7340c3675d7ac946f4019b84cd7c64ed542dfe4c
	https://git.kernel.org/stable/c/6f6dbb819dfc1a35bcb8b709b5c83a3ea8beff75