CVE-2026-45868: pinctrl: single: fix refcount leak in pcs_add_gpio_func()

CVE-2026-45868: pinctrl: single: fix refcount leak in pcs_add_gpio_func()

[Greg Kroah-Hartman]

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

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

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

pinctrl: single: fix refcount leak in pcs_add_gpio_func()

of_parse_phandle_with_args() returns a device_node pointer with refcount
incremented in gpiospec.np. The loop iterates through all phandles but
never releases the reference, causing a refcount leak on each iteration.

Add of_node_put() calls to release the reference after extracting the
needed arguments and on the error path when devm_kzalloc() fails.

This bug was detected by our static analysis tool and verified by my
code review.

The Linux kernel CVE team has assigned CVE-2026-45868 to this issue.


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

	Issue introduced in 3.10 with commit a1a277eb76b3507df7c41774048a644aa4dfd096 and fixed in 5.10.252 with commit 191bfd5710d6a7f48ba4315d8d3e908dcc15243c
	Issue introduced in 3.10 with commit a1a277eb76b3507df7c41774048a644aa4dfd096 and fixed in 5.15.202 with commit 3e3b28bb0b6ddc521a4fdd1c1ba0d35017a0796b
	Issue introduced in 3.10 with commit a1a277eb76b3507df7c41774048a644aa4dfd096 and fixed in 6.1.165 with commit 456a60d06c09a92680dc35fabca68024badcc28e
	Issue introduced in 3.10 with commit a1a277eb76b3507df7c41774048a644aa4dfd096 and fixed in 6.6.128 with commit 99cc7352156c65201c675f750e0e77c4c73d93f5
	Issue introduced in 3.10 with commit a1a277eb76b3507df7c41774048a644aa4dfd096 and fixed in 6.12.75 with commit 7814b1431848854b56717086e2b61bea3c59753d
	Issue introduced in 3.10 with commit a1a277eb76b3507df7c41774048a644aa4dfd096 and fixed in 6.18.14 with commit e2e367e56bacb93ce5ac73f0b3297d5c83d38dd4
	Issue introduced in 3.10 with commit a1a277eb76b3507df7c41774048a644aa4dfd096 and fixed in 6.19.4 with commit 5b9e84d27e310f22c4ba45fedbc4f5baf43dd823
	Issue introduced in 3.10 with commit a1a277eb76b3507df7c41774048a644aa4dfd096 and fixed in 7.0 with commit 353353309b0f7afa407df29e455f9d15b5acc296

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-2026-45868
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:
	drivers/pinctrl/pinctrl-single.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/191bfd5710d6a7f48ba4315d8d3e908dcc15243c
	https://git.kernel.org/stable/c/3e3b28bb0b6ddc521a4fdd1c1ba0d35017a0796b
	https://git.kernel.org/stable/c/456a60d06c09a92680dc35fabca68024badcc28e
	https://git.kernel.org/stable/c/99cc7352156c65201c675f750e0e77c4c73d93f5
	https://git.kernel.org/stable/c/7814b1431848854b56717086e2b61bea3c59753d
	https://git.kernel.org/stable/c/e2e367e56bacb93ce5ac73f0b3297d5c83d38dd4
	https://git.kernel.org/stable/c/5b9e84d27e310f22c4ba45fedbc4f5baf43dd823
	https://git.kernel.org/stable/c/353353309b0f7afa407df29e455f9d15b5acc296