linux-cve-announce - CVE-2022-50114: net: 9p: fix refcount leak in p9_read

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Message-ID: <2025061808-CVE-2022-50114-6adf@gregkh>
Date: Wed, 18 Jun 2025 13:02:59 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50114: net: 9p: fix refcount leak in p9_read_work() error handling

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

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

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

net: 9p: fix refcount leak in p9_read_work() error handling

p9_req_put need to be called when m->rreq->rc.sdata is NULL to avoid
temporary refcount leak.

[Dominique: commit wording adjustments, p9_req_put argument fixes for rebase]

The Linux kernel CVE team has assigned CVE-2022-50114 to this issue.


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

	Issue introduced in 4.20 with commit 728356dedeff8ef999cb436c71333ef4ac51a81c and fixed in 5.15.61 with commit 8324649b0035cbb30ebc3ca901540cb392e89041
	Issue introduced in 4.20 with commit 728356dedeff8ef999cb436c71333ef4ac51a81c and fixed in 5.18.18 with commit 622f2a467bdfbce73fd43ea74b5f0fd2caaa8c5d
	Issue introduced in 4.20 with commit 728356dedeff8ef999cb436c71333ef4ac51a81c and fixed in 5.19.2 with commit 34b9a188557c1d5a50e07cf228d054101aee0af3
	Issue introduced in 4.20 with commit 728356dedeff8ef999cb436c71333ef4ac51a81c and fixed in 6.0 with commit 4ac7573e1f9333073fa8d303acc941c9b7ab7f61
	Issue introduced in 4.19.57 with commit 3665a4d9dca1bd06bc34afb72e637fe01b2776ee

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-2022-50114
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/9p/trans_fd.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/8324649b0035cbb30ebc3ca901540cb392e89041
	https://git.kernel.org/stable/c/622f2a467bdfbce73fd43ea74b5f0fd2caaa8c5d
	https://git.kernel.org/stable/c/34b9a188557c1d5a50e07cf228d054101aee0af3
	https://git.kernel.org/stable/c/4ac7573e1f9333073fa8d303acc941c9b7ab7f61