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Date: Sun, 14 Apr 2024 11:39:26 +0100
From: Simon Horman <horms@kernel.org>
To: Bartosz Golaszewski <brgl@bgdev.pl>
Cc: Marcel Holtmann <marcel@holtmann.org>,
	Luiz Augusto von Dentz <luiz.dentz@gmail.com>,
	"David S . Miller" <davem@davemloft.net>,
	Eric Dumazet <edumazet@google.com>,
	Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
	Rob Herring <robh@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Conor Dooley <conor+dt@kernel.org>, Kalle Valo <kvalo@kernel.org>,
	Bjorn Andersson <andersson@kernel.org>,
	Konrad Dybcio <konrad.dybcio@linaro.org>,
	Liam Girdwood <lgirdwood@gmail.com>,
	Mark Brown <broonie@kernel.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>, Bjorn Helgaas <bhelgaas@google.com>,
	Saravana Kannan <saravanak@google.com>,
	Geert Uytterhoeven <geert+renesas@glider.be>,
	Arnd Bergmann <arnd@arndb.de>,
	Neil Armstrong <neil.armstrong@linaro.org>,
	Marek Szyprowski <m.szyprowski@samsung.com>,
	Alex Elder <elder@linaro.org>,
	Srini Kandagatla <srinivas.kandagatla@linaro.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Abel Vesa <abel.vesa@linaro.org>,
	Manivannan Sadhasivam <mani@kernel.org>,
	Lukas Wunner <lukas@wunner.de>,
	Dmitry Baryshkov <dmitry.baryshkov@linaro.org>,
	Amit Pundir <amit.pundir@linaro.org>,
	Xilin Wu <wuxilin123@gmail.com>, linux-bluetooth@vger.kernel.org,
	netdev@vger.kernel.org, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-wireless@vger.kernel.org,
	linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-pci@vger.kernel.org, linux-pm@vger.kernel.org,
	Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Subject: Re: [PATCH v7 13/16] power: sequencing: implement the pwrseq core
Message-ID: <20240414103926.GB645060@kernel.org>
References: <20240410124628.171783-1-brgl@bgdev.pl>
 <20240410124628.171783-14-brgl@bgdev.pl>
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In-Reply-To: <20240410124628.171783-14-brgl@bgdev.pl>

On Wed, Apr 10, 2024 at 02:46:25PM +0200, Bartosz Golaszewski wrote:

...

> +/**
> + * pwrseq_device_register() - Register a new power sequencer.
> + * @config: Configuration of the new power sequencing device.
> + *
> + * The config structure is only used during the call and can be freed after
> + * the function returns. The config structure *must* have the parent device
> + * as well as the match() callback and at least one target set.
> + *
> + * Returns:
> + * Returns the address of the new pwrseq device or ERR_PTR() on failure.
> + */
> +struct pwrseq_device *
> +pwrseq_device_register(const struct pwrseq_config *config)
> +{
> +	struct pwrseq_device *pwrseq;
> +	int ret;
> +
> +	if (!config->parent || !config->match || !config->targets ||
> +	    !config->targets[0])
> +		return ERR_PTR(-EINVAL);
> +
> +	pwrseq = kzalloc(sizeof(*pwrseq), GFP_KERNEL);
> +	if (!pwrseq)
> +		return ERR_PTR(-ENOMEM);
> +
> +	pwrseq->dev.type = &pwrseq_device_type;
> +	pwrseq->dev.bus = &pwrseq_bus;
> +	pwrseq->dev.parent = config->parent;
> +	device_set_node(&pwrseq->dev, dev_fwnode(config->parent));
> +	dev_set_drvdata(&pwrseq->dev, config->drvdata);
> +
> +	pwrseq->id = ida_alloc(&pwrseq_ida, GFP_KERNEL);
> +	if (pwrseq->id < 0) {
> +		kfree(pwrseq);

Hi Bartosz,

pwrseq is freed on the line above,
so it should not be dereferenced on the line below.

Flagged by Smatch.

> +		return ERR_PTR(pwrseq->id);
> +	}

...