linux-cve-announce - CVE-2022-49168: btrfs: do not clean up repair bio if submit fails

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Message-ID: <2025022612-CVE-2022-49168-d59d@gregkh>
Date: Wed, 26 Feb 2025 02:56:13 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2022-49168: btrfs: do not clean up repair bio if submit fails

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

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

btrfs: do not clean up repair bio if submit fails

The submit helper will always run bio_endio() on the bio if it fails to
submit, so cleaning up the bio just leads to a variety of use-after-free
and NULL pointer dereference bugs because we race with the endio
function that is cleaning up the bio.  Instead just return BLK_STS_OK as
the repair function has to continue to process the rest of the pages,
and the endio for the repair bio will do the appropriate cleanup for the
page that it was given.

The Linux kernel CVE team has assigned CVE-2022-49168 to this issue.


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

	Fixed in 5.16.19 with commit e76c78c48902dae6fa612749f59162bca0a79e0b
	Fixed in 5.17.2 with commit d1cb11fb45ebbb1e7dfe5e9038b32ea72c184b14
	Fixed in 5.18 with commit 8cbc3001a3264d998d6b6db3e23f935c158abd4d

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-2022-49168
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/btrfs/extent_io.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/e76c78c48902dae6fa612749f59162bca0a79e0b
	https://git.kernel.org/stable/c/d1cb11fb45ebbb1e7dfe5e9038b32ea72c184b14
	https://git.kernel.org/stable/c/8cbc3001a3264d998d6b6db3e23f935c158abd4d