ACPI/IORT: Switch to use kmemdup_array()

Let the kememdup_array() take care about multiplication and possible
overflows.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Hanjun Guo <guohanjun@huawei.com>
Link: https://lore.kernel.org/r/20240606165005.3031490-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Will Deacon <will@kernel.org>

Author: andy-shev

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;