linux-cve-announce - CVE-2022-50464: mt76: mt7915: Fix PCI device refcount leak in mt7915_pci_init

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Message-ID: <2025100121-CVE-2022-50464-3c96@gregkh>
Date: Wed,  1 Oct 2025 13:45:34 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50464: mt76: mt7915: Fix PCI device refcount leak in mt7915_pci_init_hif2()

From: Greg Kroah-Hartman <gregkh@...nel.org>

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

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

mt76: mt7915: Fix PCI device refcount leak in mt7915_pci_init_hif2()

As comment of pci_get_device() says, it returns a pci_device with its
refcount increased. We need to call pci_dev_put() to decrease the
refcount. Save the return value of pci_get_device() and call
pci_dev_put() to decrease the refcount.

The Linux kernel CVE team has assigned CVE-2022-50464 to this issue.


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

	Issue introduced in 5.12 with commit 9093cfff72e3e55b703ed38fa1af87c204d89cf1 and fixed in 6.0.16 with commit 8abc6579667129afd13ff2ccb0319ba3f46e6995
	Issue introduced in 5.12 with commit 9093cfff72e3e55b703ed38fa1af87c204d89cf1 and fixed in 6.1.2 with commit 2d4b9c7e81f3a4df27749ebecb426b145e68be2a
	Issue introduced in 5.12 with commit 9093cfff72e3e55b703ed38fa1af87c204d89cf1 and fixed in 6.2 with commit 5938196cc188ba4323bc6357f5ac55127d715888

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-2022-50464
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/wireless/mediatek/mt76/mt7915/pci.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/8abc6579667129afd13ff2ccb0319ba3f46e6995
	https://git.kernel.org/stable/c/2d4b9c7e81f3a4df27749ebecb426b145e68be2a
	https://git.kernel.org/stable/c/5938196cc188ba4323bc6357f5ac55127d715888