linux-kernel - RE: [PATCH v2] platform/mellanox: Add some null/error pointer checks to mlxbf-pmc.c

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Date:   Fri, 1 Dec 2023 20:35:00 +0000
From:   Vadim Pasternak <vadimp@...dia.com>
To:     Kunwu Chan <chentao@...inos.cn>,
        "hdegoede@...hat.com" <hdegoede@...hat.com>,
        "ilpo.jarvinen@...ux.intel.com" <ilpo.jarvinen@...ux.intel.com>,
        "jdelvare@...e.com" <jdelvare@...e.com>,
        "linux@...ck-us.net" <linux@...ck-us.net>,
        Shravan Ramani <shravankr@...dia.com>,
        "jiri@...nulli.us" <jiri@...nulli.us>
CC:     "kunwu.chan@...mail.com" <kunwu.chan@...mail.com>,
        "platform-driver-x86@...r.kernel.org" 
        <platform-driver-x86@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-hwmon@...r.kernel.org" <linux-hwmon@...r.kernel.org>
Subject: RE: [PATCH v2] platform/mellanox: Add some null/error pointer checks
 to mlxbf-pmc.c



> -----Original Message-----
> From: Kunwu Chan <chentao@...inos.cn>
> Sent: Friday, 1 December 2023 7:55
> To: hdegoede@...hat.com; ilpo.jarvinen@...ux.intel.com; Vadim Pasternak
> <vadimp@...dia.com>; jdelvare@...e.com; linux@...ck-us.net; Shravan
> Ramani <shravankr@...dia.com>; jiri@...nulli.us
> Cc: kunwu.chan@...mail.com; platform-driver-x86@...r.kernel.org; linux-
> kernel@...r.kernel.org; linux-hwmon@...r.kernel.org; Kunwu Chan
> <chentao@...inos.cn>
> Subject: [PATCH v2] platform/mellanox: Add some null/error pointer checks to
> mlxbf-pmc.c
> 
> devm_kasprintf() returns a pointer to dynamically allocated memory which
> can be NULL upon failure.
> devm_hwmon_device_register_with_groups return a error pointer upon
> failure.
> 
> Compile-tested only.
> 
> Fixes: 1a218d312e65 ("platform/mellanox: mlxbf-pmc: Add Mellanox
> BlueField PMC driver")
> Suggested-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
> Suggested-by: Vadim Pasternak <vadimp@...dia.com>
> Signed-off-by: Kunwu Chan <chentao@...inos.cn>

Reviewed-by: Vadim Pasternak <vadimp@...dia.com>

> ---
>  drivers/platform/mellanox/mlxbf-pmc.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/drivers/platform/mellanox/mlxbf-pmc.c
> b/drivers/platform/mellanox/mlxbf-pmc.c
> index 0b427fc24a96..1dd84c7a79de 100644
> --- a/drivers/platform/mellanox/mlxbf-pmc.c
> +++ b/drivers/platform/mellanox/mlxbf-pmc.c
> @@ -1771,6 +1771,8 @@ static int mlxbf_pmc_init_perftype_counter(struct
> device *dev, int blk_num)
>  	attr->dev_attr.show = mlxbf_pmc_event_list_show;
>  	attr->nr = blk_num;
>  	attr->dev_attr.attr.name = devm_kasprintf(dev, GFP_KERNEL,
> "event_list");
> +	if (!attr->dev_attr.attr.name)
> +		return -ENOMEM;
>  	pmc->block[blk_num].block_attr[i] = &attr->dev_attr.attr;
>  	attr = NULL;
> 
> @@ -1784,6 +1786,8 @@ static int mlxbf_pmc_init_perftype_counter(struct
> device *dev, int blk_num)
>  		attr->nr = blk_num;
>  		attr->dev_attr.attr.name = devm_kasprintf(dev, GFP_KERNEL,
>  							  "enable");
> +		if (!attr->dev_attr.attr.name)
> +			return -ENOMEM;
>  		pmc->block[blk_num].block_attr[++i] = &attr->dev_attr.attr;
>  		attr = NULL;
>  	}
> @@ -1810,6 +1814,8 @@ static int mlxbf_pmc_init_perftype_counter(struct
> device *dev, int blk_num)
>  		attr->nr = blk_num;
>  		attr->dev_attr.attr.name = devm_kasprintf(dev, GFP_KERNEL,
>  							  "counter%d", j);
> +		if (!attr->dev_attr.attr.name)
> +			return -ENOMEM;
>  		pmc->block[blk_num].block_attr[++i] = &attr->dev_attr.attr;
>  		attr = NULL;
> 
> @@ -1821,6 +1827,8 @@ static int mlxbf_pmc_init_perftype_counter(struct
> device *dev, int blk_num)
>  		attr->nr = blk_num;
>  		attr->dev_attr.attr.name = devm_kasprintf(dev, GFP_KERNEL,
>  							  "event%d", j);
> +		if (!attr->dev_attr.attr.name)
> +			return -ENOMEM;
>  		pmc->block[blk_num].block_attr[++i] = &attr->dev_attr.attr;
>  		attr = NULL;
>  	}
> @@ -1853,6 +1861,8 @@ static int mlxbf_pmc_init_perftype_reg(struct
> device *dev, int blk_num)
>  		attr->nr = blk_num;
>  		attr->dev_attr.attr.name = devm_kasprintf(dev, GFP_KERNEL,
>  							  events[j].evt_name);
> +		if (!attr->dev_attr.attr.name)
> +			return -ENOMEM;
>  		pmc->block[blk_num].block_attr[i] = &attr->dev_attr.attr;
>  		attr = NULL;
>  		i++;
> @@ -1882,6 +1892,8 @@ 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++;
> 
> @@ -2063,6 +2075,8 @@ static int mlxbf_pmc_probe(struct platform_device
> *pdev)
> 
>  	pmc->hwmon_dev = devm_hwmon_device_register_with_groups(
>  		dev, "bfperf", pmc, pmc->groups);
> +	if (IS_ERR(pmc->hwmon_dev))
> +		return PTR_ERR(pmc->hwmon_dev);
>  	platform_set_drvdata(pdev, pmc);
> 
>  	return 0;
> --
> 2.34.1