linux-cve-announce - CVE-2022-50192: spi: tegra20-slink: fix UAF in tegra_slink

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Message-ID: <2025061837-CVE-2022-50192-79d9@gregkh>
Date: Wed, 18 Jun 2025 13:04:17 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50192: spi: tegra20-slink: fix UAF in tegra_slink_remove()

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

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

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

spi: tegra20-slink: fix UAF in tegra_slink_remove()

After calling spi_unregister_master(), the refcount of master will
be decrease to 0, and it will be freed in spi_controller_release(),
the device data also will be freed, so it will lead a UAF when using
'tspi'. To fix this, get the master before unregister and put it when
finish using it.

The Linux kernel CVE team has assigned CVE-2022-50192 to this issue.


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

	Issue introduced in 5.15 with commit 26c863418221344b1cfb8e6c11116b2b81144281 and fixed in 5.15.61 with commit 415b4ce61308f24583912d887772dfcbf97f1d20
	Issue introduced in 5.15 with commit 26c863418221344b1cfb8e6c11116b2b81144281 and fixed in 5.18.18 with commit 800c7767e05d29656713e04532823a752e57e037
	Issue introduced in 5.15 with commit 26c863418221344b1cfb8e6c11116b2b81144281 and fixed in 5.19.2 with commit 67f77172644260482fdafc03b6025847944701e5
	Issue introduced in 5.15 with commit 26c863418221344b1cfb8e6c11116b2b81144281 and fixed in 6.0 with commit 7e9984d183bb1e99e766c5c2b950ff21f7f7b6c0

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-2022-50192
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/spi/spi-tegra20-slink.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/415b4ce61308f24583912d887772dfcbf97f1d20
	https://git.kernel.org/stable/c/800c7767e05d29656713e04532823a752e57e037
	https://git.kernel.org/stable/c/67f77172644260482fdafc03b6025847944701e5
	https://git.kernel.org/stable/c/7e9984d183bb1e99e766c5c2b950ff21f7f7b6c0