linux-kernel - Re: [PATCH] platform/mellanox: Add a null pointer check in mlxbf_pmc_create

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Message-ID: <5aa96a9-336a-d865-d6b9-3857ebe89db@linux.intel.com>
Date:   Tue, 28 Nov 2023 11:51:16 +0200 (EET)
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     Kunwu Chan <chentao@...inos.cn>
cc:     Hans de Goede <hdegoede@...hat.com>, vadimp@...dia.com,
        jiri@...nulli.us, shravankr@...dia.com, kunwu.chan@...mail.com,
        platform-driver-x86@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] platform/mellanox: Add a null pointer check in
 mlxbf_pmc_create_groups

On Mon, 27 Nov 2023, Kunwu Chan wrote:

> devm_kasprintf() returns a pointer to dynamically allocated memory
> which can be NULL upon failure.
> 
> Fixes: 1a218d312e65 ("platform/mellanox: mlxbf-pmc: Add Mellanox BlueField PMC driver")
> Signed-off-by: Kunwu Chan <chentao@...inos.cn>
> ---
>  drivers/platform/mellanox/mlxbf-pmc.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/platform/mellanox/mlxbf-pmc.c b/drivers/platform/mellanox/mlxbf-pmc.c
> index 0b427fc24a96..59bbe5e13f6b 100644
> --- a/drivers/platform/mellanox/mlxbf-pmc.c
> +++ b/drivers/platform/mellanox/mlxbf-pmc.c
> @@ -1882,6 +1882,8 @@ static int mlxbf_pmc_create_groups(struct device *dev, int blk_num)
>  	pmc->block[blk_num].block_attr_grp.attrs = pmc->block[blk_num].block_attr;
>  	pmc->block[blk_num].block_attr_grp.name = devm_kasprintf(
>  		dev, GFP_KERNEL, pmc->block_name[blk_num]);
> +	if (!pmc->block[blk_num].block_attr_grp.name)
> +		return -ENOMEM;
>  	pmc->groups[pmc->group_num] = &pmc->block[blk_num].block_attr_grp;
>  	pmc->group_num++;

I'm totally lost, why did you fix only one devm_kasprintf() location?
Don't all of them need this check?

-- 
 i.