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

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Message-ID: <2edd3b72-24a4-8b19-8738-cc82dc4fae6c@huawei.com>
Date: Fri, 14 Jun 2024 08:54:39 +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>, Catalin Marinas <catalin.marinas@....com>
Subject: Re: [PATCH v1 1/1] ACPI/IORT: Switch to use kmemdup_array()

+Cc Catalin

On 2024/6/11 18:42, Hanjun Guo wrote:
> 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>

Catalin, would you mind pick this up as well?

Thanks
Hanjun