CVE-2026-90147: clk: devres: fix cleanup in devm_clk_get_optional_enabled_with_rate()

CVE-2026-90147: clk: devres: fix cleanup in devm_clk_get_optional_enabled_with_rate()

[Greg Kroah-Hartman]

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

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

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

clk: devres: fix cleanup in devm_clk_get_optional_enabled_with_rate()

devm_clk_get_optional_enabled_with_rate() registers its cleanup action
before setting the clock rate. If setting the rate fails, it attempts to
disable and unprepare a clock that was never enabled. This issue was
spotted while reviewing "rust: clk: add devres-managed clks" [1].

Register the cleanup action only after successfully preparing and enabling
the clock.

[1]: https://lore.kernel.org/rust-for-linux/20260706-clk-type-state-v5-3-67c5f326a16c@collabora.com

The Linux kernel CVE team has assigned CVE-2026-90147 to this issue.


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

	Issue introduced in 6.12 with commit 9934a1bd45b2b03f6d1204a6ae2780d3b009799f and fixed in 6.12.110 with commit 9a365f41fe0f227ef5a269e240233bd0bffc66c9
	Issue introduced in 6.12 with commit 9934a1bd45b2b03f6d1204a6ae2780d3b009799f and fixed in 6.18.52 with commit 9d4843f1051259854f724e9cdc5b9eac56327037
	Issue introduced in 6.12 with commit 9934a1bd45b2b03f6d1204a6ae2780d3b009799f and fixed in 7.2.6 with commit 647157fecb42b72d930e7b7d0bfbc5f2db9a858a
	Issue introduced in 6.12 with commit 9934a1bd45b2b03f6d1204a6ae2780d3b009799f and fixed in 7.3-rc1 with commit 0d4d262c1664365e17e0a5ba2ab79f4db484b44e

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-2026-90147
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/clk/clk-devres.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/9a365f41fe0f227ef5a269e240233bd0bffc66c9
	https://git.kernel.org/stable/c/9d4843f1051259854f724e9cdc5b9eac56327037
	https://git.kernel.org/stable/c/647157fecb42b72d930e7b7d0bfbc5f2db9a858a
	https://git.kernel.org/stable/c/0d4d262c1664365e17e0a5ba2ab79f4db484b44e