linux-cve-announce - CVE-2022-49815: erofs: fix missing xas

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Message-ID: <2025050131-CVE-2022-49815-ebd2@gregkh>
Date: Thu,  1 May 2025 16:10:05 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-49815: erofs: fix missing xas_retry() in fscache mode

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

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

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

erofs: fix missing xas_retry() in fscache mode

The xarray iteration only holds the RCU read lock and thus may encounter
XA_RETRY_ENTRY if there's process modifying the xarray concurrently.
This will cause oops when referring to the invalid entry.

Fix this by adding the missing xas_retry(), which will make the
iteration wind back to the root node if XA_RETRY_ENTRY is encountered.

The Linux kernel CVE team has assigned CVE-2022-49815 to this issue.


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

	Issue introduced in 5.19 with commit d435d53228dd039fffecae123b8c138af6f96f99 and fixed in 6.0.10 with commit dbc98fe99e17ed18f2f272d5fe880d844b1c68c3
	Issue introduced in 5.19 with commit d435d53228dd039fffecae123b8c138af6f96f99 and fixed in 6.1 with commit 37020bbb71d911431e16c2c940b97cf86ae4f2f6

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-2022-49815
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:
	fs/erofs/fscache.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/dbc98fe99e17ed18f2f272d5fe880d844b1c68c3
	https://git.kernel.org/stable/c/37020bbb71d911431e16c2c940b97cf86ae4f2f6