linux-kernel - Re: [PATCH v2] rust: devres: fix leaking call to devm_add

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Message-Id: <DC0SD4G19EOX.3V3LFT84NMMVP@kernel.org>
Date: Wed, 13 Aug 2025 00:01:10 +0200
From: "Benno Lossin" <lossin@...nel.org>
To: "Danilo Krummrich" <dakr@...nel.org>, <gregkh@...uxfoundation.org>,
 <rafael@...nel.org>, <ojeda@...nel.org>, <alex.gaynor@...il.com>,
 <boqun.feng@...il.com>, <gary@...yguo.net>, <bjorn3_gh@...tonmail.com>,
 <a.hindborg@...nel.org>, <aliceryhl@...gle.com>, <tmgross@...ch.edu>
Cc: <rust-for-linux@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] rust: devres: fix leaking call to devm_add_action()

On Tue Aug 12, 2025 at 3:09 PM CEST, Danilo Krummrich wrote:
> When the data argument of Devres::new() is Err(), we leak the preceding
> call to devm_add_action().
>
> In order to fix this, call devm_add_action() in a unit type initializer in
> try_pin_init!() after the initializers of all other fields.
>
> Fixes: f5d3ef25d238 ("rust: devres: get rid of Devres' inner Arc")
> Signed-off-by: Danilo Krummrich <dakr@...nel.org>

Reviewed-by: Benno Lossin <lossin@...nel.org>

---
Cheers,
Benno

> ---
> Changes in v2:
>   - Drop inner in-place when devm_add_action() fails.
>   - Document to remove drop_in_place() once we can switch to UnsafePinned.
> ---
>  rust/kernel/devres.rs | 27 ++++++++++++++++++---------
>  1 file changed, 18 insertions(+), 9 deletions(-)