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

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Date:   Wed, 8 Dec 2021 14:56:34 +0800
From:   Guo Zhengkui <guozhengkui@...o.com>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
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 <kernel@...o.com>
Subject: Re: [PATCH] phy: qcom: fix bug: application of sizeof to pointer

On 2021/12/7 23:13, Bjorn Andersson wrote:
> 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?
> 

OK, I will commit another patch. Do you mind I add a "Suggested-by" tag 
of your name in the new patch?

Zhengkui

> And please add:
> Fixes: f199223cb490 ("phy: qcom: Introduce new eDP PHY driver")
> 
> Regards,
> Bjorn
> 
>>   	if (!data)
>>   		return -ENOMEM;
>>   
>> -- 
>> 2.20.1
>>