linux-kernel - Re: [PATCH] phy: qcom: fix bug: application of sizeof to pointer

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Message-ID: <Ya96KOynsO478cVx@ripper>
Date:   Tue, 7 Dec 2021 07:13:44 -0800
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Guo Zhengkui <guozhengkui@...o.com>
Cc:     Andy Gross <agross@...nel.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>,
        "open list:ARM/QUALCOMM SUPPORT" <linux-arm-msm@...r.kernel.org>,
        "open list:GENERIC PHY FRAMEWORK" <linux-phy@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>, kernel@...o.com
Subject: Re: [PATCH] phy: qcom: fix bug: application of sizeof to pointer

On Tue 07 Dec 05:16 PST 2021, Guo Zhengkui wrote:

> Fix following coccicheck error:
> ./drivers/phy/qualcomm/phy-qcom-edp.c:574:31-37:
> ERROR: application of sizeof to pointer.
> 
> Use sizeof(*data) instead.
> 
> Signed-off-by: Guo Zhengkui <guozhengkui@...o.com>
> ---
>  drivers/phy/qualcomm/phy-qcom-edp.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/phy/qualcomm/phy-qcom-edp.c b/drivers/phy/qualcomm/phy-qcom-edp.c
> index 17d5653b661d..5fe4eab9cac1 100644
> --- a/drivers/phy/qualcomm/phy-qcom-edp.c
> +++ b/drivers/phy/qualcomm/phy-qcom-edp.c
> @@ -571,7 +571,7 @@ static int qcom_edp_clks_register(struct qcom_edp *edp, struct device_node *np)
>  	struct clk_init_data init = { };
>  	int ret;
>  
> -	data = devm_kzalloc(edp->dev, sizeof(data), GFP_KERNEL);
> +	data = devm_kzalloc(edp->dev, sizeof(*data), GFP_KERNEL);

Ouch, thanks for catching that!

But the clk_hw_onecell_data actually has a variable size array at the
end and as you can see further down I store 2 items in that array.

So that sizeof should be struct_size(data, hws, 2)

Would you be willing to update your patch with that?

And please add:
Fixes: f199223cb490 ("phy: qcom: Introduce new eDP PHY driver")

Regards,
Bjorn

>  	if (!data)
>  		return -ENOMEM;
>  
> -- 
> 2.20.1
>