linux-kernel - Re: [PATCH v1 1/1] ACPI/IORT: Switch to use kmemdup

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Date: Tue, 11 Jun 2024 18:42:11 +0800
From: Hanjun Guo <guohanjun@...wei.com>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	<linux-acpi@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
CC: Lorenzo Pieralisi <lpieralisi@...nel.org>, Sudeep Holla
	<sudeep.holla@....com>, "Rafael J. Wysocki" <rafael@...nel.org>, Len Brown
	<lenb@...nel.org>
Subject: Re: [PATCH v1 1/1] ACPI/IORT: Switch to use kmemdup_array()

On 2024/6/7 0:50, Andy Shevchenko wrote:
> Let the kememdup_array() take care about multiplication and possible
> overflows.
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>   drivers/acpi/arm64/iort.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
> index c0b1c2c19444..e596dff20f1e 100644
> --- a/drivers/acpi/arm64/iort.c
> +++ b/drivers/acpi/arm64/iort.c
> @@ -822,7 +822,7 @@ static struct iommu_iort_rmr_data *iort_rmr_alloc(
>   		return NULL;
>   
>   	/* Create a copy of SIDs array to associate with this rmr_data */
> -	sids_copy = kmemdup(sids, num_sids * sizeof(*sids), GFP_KERNEL);
> +	sids_copy = kmemdup_array(sids, num_sids, sizeof(*sids), GFP_KERNEL);
>   	if (!sids_copy) {
>   		kfree(rmr_data);
>   		return NULL;

Looks good to me,

Acked-by: Hanjun Guo <guohanjun@...wei.com>