linux-cve-announce - CVE-2022-50267: mmc: rtsx_pci: fix return value check of mmc_add

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Message-ID: <2025091504-CVE-2022-50267-2de9@gregkh>
Date: Mon, 15 Sep 2025 16:21:09 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50267: mmc: rtsx_pci: fix return value check of mmc_add_host()

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

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

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

mmc: rtsx_pci: fix return value check of mmc_add_host()

mmc_add_host() may return error, if we ignore its return value, the memory
that allocated in mmc_alloc_host() will be leaked and it will lead a kernel
crash because of deleting not added device in the remove path.

So fix this by checking the return value and calling mmc_free_host() in the
error path, beside, runtime PM also needs be disabled.

The Linux kernel CVE team has assigned CVE-2022-50267 to this issue.


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

	Issue introduced in 3.8 with commit ff984e57d36e8ac468849a144a36f1c11f88b61c and fixed in 5.15.86 with commit 30dc645461dfc63e52b3af8ee4a98e17bf14bacf
	Issue introduced in 3.8 with commit ff984e57d36e8ac468849a144a36f1c11f88b61c and fixed in 6.0.16 with commit 5cd4e04eccaec140da6fa04db056a76282ee6852
	Issue introduced in 3.8 with commit ff984e57d36e8ac468849a144a36f1c11f88b61c and fixed in 6.1.2 with commit ffa9b2a79e3e959683efbad3f6db937eca9d38f5
	Issue introduced in 3.8 with commit ff984e57d36e8ac468849a144a36f1c11f88b61c and fixed in 6.2 with commit 0c87db77423a282b3b38b8a6daf057b822680516

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-2022-50267
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/mmc/host/rtsx_pci_sdmmc.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/30dc645461dfc63e52b3af8ee4a98e17bf14bacf
	https://git.kernel.org/stable/c/5cd4e04eccaec140da6fa04db056a76282ee6852
	https://git.kernel.org/stable/c/ffa9b2a79e3e959683efbad3f6db937eca9d38f5
	https://git.kernel.org/stable/c/0c87db77423a282b3b38b8a6daf057b822680516