linux-kernel - Re: [PATCH v2 1/4] crypto: hisilicon/qm

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Message-ID: <a8bc45c1-4fb1-b99a-fcac-adc9f14f400f@huawei.com>
Date:   Mon, 7 Nov 2022 18:46:36 +0800
From:   "yekai (A)" <yekai13@...wei.com>
To:     Herbert Xu <herbert@...dor.apana.org.au>
CC:     <linux-crypto@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <wangzhou1@...ilicon.com>
Subject: Re: [PATCH v2 1/4] crypto: hisilicon/qm - modify the process of regs
 dfx



On 2022/11/7 16:47, Herbert Xu wrote:
> On Mon, Nov 07, 2022 at 02:53:28PM +0800, yekai (A) wrote:
>>
>> On 2022/11/5 18:18, Herbert Xu wrote:
>>> On Sat, Nov 05, 2022 at 09:53:54AM +0000, Kai Ye wrote:
>>>> +static void dfx_regs_uninit(struct hisi_qm *qm,
>>>> +		struct dfx_diff_registers *dregs, int reg_len)
>>>> +{
>>>> +	int i;
>>>> +
>>>> +	/* Setting the pointer is NULL to prevent double free */
>>>> +	for (i = 0; i < reg_len; i++) {
>>>> +		kfree(dregs[i].regs);
>>>> +		dregs[i].regs = NULL;
>>>> +	}
>>>> +	kfree(dregs);
>>>> +	dregs = NULL;
>>>> +}
>>> The line that I complained about is still here.
>>>
>>> Cheers,
>> ok
> Just to be clear, it's the last line "dregs = NULL" that I was
> referring to.  It makes no sense to zero a variable that is on
> the stack.
>
> Cheers,

I got it. I will fix it and resend the patch set in the next version.

Thanks
Kai