linux-kernel - Re: [PATCH 1/4] selftests/resctrl: Return error if memory is not allocated

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Date:   Mon, 13 Feb 2023 17:00:27 -0800
From:   Reinette Chatre <reinette.chatre@...el.com>
To:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        <linux-kselftest@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Shuah Khan <shuah@...nel.org>, Babu Moger <babu.moger@....com>,
        Sai Praneeth Prakhya <sai.praneeth.prakhya@...el.com>
Subject: Re: [PATCH 1/4] selftests/resctrl: Return error if memory is not
 allocated

Hi Ilpo,

I do not see a why two patch series are needed for
the resctrl fixes. It may make it easier for everybody if
it is handled as one patch series (with fixes first)?

On 2/8/2023 1:30 AM, Ilpo Järvinen wrote:
> From: Fenghua Yu <fenghua.yu@...el.com>
> 
> malloc_and_init_memory() in fill_buf isn't checking if memalign()
> successfully allocated memory or not before accessing the memory.
> 
> Check the return value of memalign() and return NULL if allocating
> aligned memory fails.
> 
> Fixes: a2561b12fe39 ("selftests/resctrl: Add built in benchmark")
> Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>

Missing your Signed-off-by?

> ---
>  tools/testing/selftests/resctrl/fill_buf.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/tools/testing/selftests/resctrl/fill_buf.c b/tools/testing/selftests/resctrl/fill_buf.c
> index 56ccbeae0638..f4880c962ec4 100644
> --- a/tools/testing/selftests/resctrl/fill_buf.c
> +++ b/tools/testing/selftests/resctrl/fill_buf.c
> @@ -68,6 +68,8 @@ static void *malloc_and_init_memory(size_t s)
>  	size_t s64;
>  
>  	void *p = memalign(PAGE_SIZE, s);

This may also be a good time to stop using an obsolete call?

> +	if (!p)
> +		return p;

Could you please return NULL explicitly?

>  
>  	p64 = (uint64_t *)p;
>  	s64 = s / sizeof(uint64_t);


Reinette