linux-kernel - Re: [PATCH] hv_netvsc: Add check for kvmalloc

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Message-Id: <20220314083500.2501146-1-jiasheng@iscas.ac.cn>
Date:   Mon, 14 Mar 2022 16:35:00 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     gregkh@...uxfoundation.org
Cc:     stephen@...workplumber.org, kys@...rosoft.com,
        haiyangz@...rosoft.com, sthemmin@...rosoft.com, wei.liu@...nel.org,
        decui@...rosoft.com, davem@...emloft.net, kuba@...nel.org,
        ast@...nel.org, daniel@...earbox.net, hawk@...nel.org,
        john.fastabend@...il.com, andrii@...nel.org, kafai@...com,
        songliubraving@...com, yhs@...com, kpsingh@...nel.org,
        linux-hyperv@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, bpf@...r.kernel.org,
        Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: Re: [PATCH] hv_netvsc: Add check for kvmalloc_array

On Mon, Mar 14, 2022 at 04:13:59PM +0800, Greg KH wrote:
>> The failure of allocation is not included in the tests.
>> And as far as I know, there is not any tool that has the
>> ability to fail the allocation.
> 
> There are tools that do this.
> 

Thanks, could you please tell me the tools?

Jiang

>> But I think that for safety, the cost of redundant and harmless
>> check is acceptable.
>> Also, checking after allocation is a good program pattern.
> 
> That's fine, it's how you clean up that is the problem that not everyone
> gets correct, which is why it is good to verify that you do not
> introduce problems.