ACK: [SRU][J][PATCH 0/1] CVE-2025-38259

[Edoardo Canepa]

Acked-by: Edoardo Canepa <edoardo.canepa at canonical.com>

On 9/11/26 00:04, Cengiz Can via kernel-team wrote:
> https://ubuntu.com/security/CVE-2025-38259
>
> [ Impact ]
>
> In the Linux kernel, the following vulnerability has been resolved:
>
> ASoC: codecs: wcd9335: Fix missing free of regulator supplies
>
> Driver gets and enables all regulator supplies in probe path
> (wcd9335_parse_dt() and wcd9335_power_on_reset()), but does not cleanup in
> final error paths and in unbind (missing remove() callback). This leads to
> leaked memory and unbalanced regulator enable count during probe errors or
> unbind.
>
> Fix this by converting entire code into devm_regulator_bulk_get_enable() which
> also greatly simplifies the code.
>
> [ Fix ]
>
> jammy/linux: backported from 9079db287fc3
>
> Note that devm_regulator_bulk_get_enable() does not exist in the 5.15
> kernel, so its semantics were reimplemented for jammy: the supplies[]
> struct field and names are kept, devm_regulator_bulk_get() is used to fix
> the memory leak, and regulator_bulk_enable() in parse_dt is paired with
> devm_add_action_or_reset() to disable the supplies on unbind or error,
> fixing the enable-count imbalance.
>
> [ Test Plan ]
>
> Build and boot tested.
>
> [ Where Problems Could Occur ]
>
> A bad fix would affect systems that use the Qualcomm WCD9335 audio codec,
> found on certain Qualcomm SoC based boards, where a regression could show
> up as failed audio codec probe or power sequencing issues during driver
> bind and unbind. Systems without this codec do not load the driver and are
> not affected.
>
> [ Other Info ]
>
> Kybele flow-v11-25-ga27c0fa6. Reference: c737c315/v1
>
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