CVE-2026-64241: gpio: rockchip: teardown bugs and resource leaks

From: Greg Kroah-Hartman <[email protected]>

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

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

gpio: rockchip: teardown bugs and resource leaks

Address several teardown issues and resource leaks in the driver's remove
path and error handling:

1. Debounce clock reference leak: The debounce clock (bank->db_clk) is
   obtained using of_clk_get() which increments the clock's reference
   count, but clk_put() is never called. Register a devm action to
   cleanly release it on unbind. Note that of_clk_get(..., 1) remains
   necessary over devm_clk_get() because the DT binding does not define
   clock-names, precluding name-based lookup.

2. Unregistered chained IRQ handler: The chained IRQ handler is not
   disconnected in remove(). If a stray interrupt fires after the driver
   is removed, the kernel attempts to execute a stale handler, leading
   to a panic. Fix this by clearing the handler in remove().

3. IRQ domain leak: The linear IRQ domain and its generic chips are
   allocated manually during probe but never removed. Remove the IRQ
   domain during driver teardown to free the associated generic chips
   and mappings.

[Bartosz: don't emit an error message on devres allocation failure]

The Linux kernel CVE team has assigned CVE-2026-64241 to this issue.


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

	Issue introduced in 5.15 with commit 936ee2675eee1faca0dcdfa79165c7990422e0fc and fixed in 6.12.96 with commit cdc603ce3118232712ba443dd8b414d8f25ca467
	Issue introduced in 5.15 with commit 936ee2675eee1faca0dcdfa79165c7990422e0fc and fixed in 6.18.35 with commit 7f945f7f10f442270518dfd768d230227c495fcf
	Issue introduced in 5.15 with commit 936ee2675eee1faca0dcdfa79165c7990422e0fc and fixed in 7.0.12 with commit 6be81e77e1748665d7ddab9128ff1d35eb75b87d
	Issue introduced in 5.15 with commit 936ee2675eee1faca0dcdfa79165c7990422e0fc and fixed in 7.1 with commit 9500077678230e36d22bf16d2b9539c13e59a801

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-2026-64241
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/gpio/gpio-rockchip.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/cdc603ce3118232712ba443dd8b414d8f25ca467
	https://git.kernel.org/stable/c/7f945f7f10f442270518dfd768d230227c495fcf
	https://git.kernel.org/stable/c/6be81e77e1748665d7ddab9128ff1d35eb75b87d
	https://git.kernel.org/stable/c/9500077678230e36d22bf16d2b9539c13e59a801