linux-cve-announce - CVE-2022-49996: btrfs: fix possible memory leak in btrfs_get_dev_args_from

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Message-ID: <2025061826-CVE-2022-49996-71e2@gregkh>
Date: Wed, 18 Jun 2025 13:01:01 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-49996: btrfs: fix possible memory leak in btrfs_get_dev_args_from_path()

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

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

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

btrfs: fix possible memory leak in btrfs_get_dev_args_from_path()

In btrfs_get_dev_args_from_path(), btrfs_get_bdev_and_sb() can fail if
the path is invalid. In this case, btrfs_get_dev_args_from_path()
returns directly without freeing args->uuid and args->fsid allocated
before, which causes memory leak.

To fix these possible leaks, when btrfs_get_bdev_and_sb() fails,
btrfs_put_dev_args_from_path() is called to clean up the memory.

The Linux kernel CVE team has assigned CVE-2022-49996 to this issue.


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

	Issue introduced in 5.15.54 with commit 321a81835b4aed4f717f89921286f6544ffa8be9 and fixed in 5.15.64 with commit 5f52402c77013e4a826394b807dd5ea4dc83bd72
	Issue introduced in 5.16 with commit faa775c41d655a4786e9d53cb075a77bb5a75f66 and fixed in 5.19.6 with commit 4b124ad87244cd7f0883c5eaa38d2326b2154cad
	Issue introduced in 5.16 with commit faa775c41d655a4786e9d53cb075a77bb5a75f66 and fixed in 6.0 with commit 9ea0106a7a3d8116860712e3f17cd52ce99f6707

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-2022-49996
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/volumes.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/5f52402c77013e4a826394b807dd5ea4dc83bd72
	https://git.kernel.org/stable/c/4b124ad87244cd7f0883c5eaa38d2326b2154cad
	https://git.kernel.org/stable/c/9ea0106a7a3d8116860712e3f17cd52ce99f6707