linux-cve-announce - CVE-2022-50046: net/sunrpc: fix potential memory leaks in rpc_sysfs_xprt_state

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Message-ID: <2025061844-CVE-2022-50046-9cac@gregkh>
Date: Wed, 18 Jun 2025 13:01:51 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50046: net/sunrpc: fix potential memory leaks in rpc_sysfs_xprt_state_change()

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

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

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

net/sunrpc: fix potential memory leaks in rpc_sysfs_xprt_state_change()

The issue happens on some error handling paths. When the function
fails to grab the object `xprt`, it simply returns 0, forgetting to
decrease the reference count of another object `xps`, which is
increased by rpc_sysfs_xprt_kobj_get_xprt_switch(), causing refcount
leaks. Also, the function forgets to check whether `xps` is valid
before using it, which may result in NULL-dereferencing issues.

Fix it by adding proper error handling code when either `xprt` or
`xps` is NULL.

The Linux kernel CVE team has assigned CVE-2022-50046 to this issue.


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

	Issue introduced in 5.14 with commit 5b7eb78486cd9ac58bfbd6d84ea0fe2d9fead03b and fixed in 5.15.63 with commit c0434f0e058648649250b8ed6078b66d773de723
	Issue introduced in 5.14 with commit 5b7eb78486cd9ac58bfbd6d84ea0fe2d9fead03b and fixed in 5.19.4 with commit 76fbeb1662b1c56514325118a07fba74dc4c79fe
	Issue introduced in 5.14 with commit 5b7eb78486cd9ac58bfbd6d84ea0fe2d9fead03b and fixed in 6.0 with commit bfc48f1b0505ffcb03a6d749139b7577d6b81ae0

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-2022-50046
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:
	net/sunrpc/sysfs.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/c0434f0e058648649250b8ed6078b66d773de723
	https://git.kernel.org/stable/c/76fbeb1662b1c56514325118a07fba74dc4c79fe
	https://git.kernel.org/stable/c/bfc48f1b0505ffcb03a6d749139b7577d6b81ae0