linux-cve-announce - CVE-2024-50274: idpf: avoid vport access in idpf_get_link

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Message-ID: <2024111932-CVE-2024-50274-a441@gregkh>
Date: Tue, 19 Nov 2024 02:32:29 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-50274: idpf: avoid vport access in idpf_get_link_ksettings

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

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

idpf: avoid vport access in idpf_get_link_ksettings

When the device control plane is removed or the platform
running device control plane is rebooted, a reset is detected
on the driver. On driver reset, it releases the resources and
waits for the reset to complete. If the reset fails, it takes
the error path and releases the vport lock. At this time if the
monitoring tools tries to access link settings, it call traces
for accessing released vport pointer.

To avoid it, move link_speed_mbps to netdev_priv structure
which removes the dependency on vport pointer and the vport lock
in idpf_get_link_ksettings. Also use netif_carrier_ok()
to check the link status and adjust the offsetof to use link_up
instead of link_speed_mbps.

The Linux kernel CVE team has assigned CVE-2024-50274 to this issue.

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

	Issue introduced in 6.7 with commit 02cbfba1add5 and fixed in 6.11.8 with commit fa4d906ad0fb
	Issue introduced in 6.7 with commit 02cbfba1add5 and fixed in 6.12 with commit 81d2fb4c7c18

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-2024-50274
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/net/ethernet/intel/idpf/idpf.h
	drivers/net/ethernet/intel/idpf/idpf_ethtool.c
	drivers/net/ethernet/intel/idpf/idpf_lib.c
	drivers/net/ethernet/intel/idpf/idpf_virtchnl.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/fa4d906ad0fb63a980a1d586a061c78ea1a345ba
	https://git.kernel.org/stable/c/81d2fb4c7c18a3b36ba3e00b9d5b753107472d75