linux-kernel - Re: [PATCH v2 2/6] ACPI: scan: Extract CSI-2 connection graph from

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Message-ID: <ZUC_OQwk_dwNYU_N@kekkonen.localdomain>
Date:   Tue, 31 Oct 2023 08:47:53 +0000
From:   Sakari Ailus <sakari.ailus@...ux.intel.com>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     Linux ACPI <linux-acpi@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/6] ACPI: scan: Extract CSI-2 connection graph from
 _CRS

Hi Rafael,

On Fri, Oct 20, 2023 at 04:36:28PM +0200, Rafael J. Wysocki wrote:
> +#define NO_CSI2_PORT (UINT_MAX - 1)
> +
> +static void alloc_crs_csi2_swnodes(struct crs_csi2 *csi2)
> +{
> +	size_t port_count = csi2->port_count;
> +	struct acpi_device_software_nodes *swnodes;
> +	size_t alloc_size;
> +	unsigned int i;
> +
> +	/*
> +	 * Allocate memory for ports, node pointers (number of nodes +
> +	 * 1 (guardian), nodes (root + number of ports * 2 (because for
> +	 * every port there is an endpoint)).
> +	 */
> +	if (check_mul_overflow(sizeof(*swnodes->ports) +
> +			       sizeof(*swnodes->nodes) * 2 +
> +			       sizeof(*swnodes->nodeptrs) * 2,
> +			       port_count, &alloc_size))
> +		goto overflow;
> +
> +	if (check_add_overflow(sizeof(*swnodes) +
> +			       sizeof(*swnodes->nodes) +
> +			       sizeof(*swnodes->nodeptrs) * 2,
> +			       alloc_size, &alloc_size))
> +		goto overflow;
> +
> +	swnodes = kmalloc(alloc_size, GFP_KERNEL);
> +	if (!swnodes)
> +		return;
> +
> +	swnodes->ports = (struct acpi_device_software_node_port *)(swnodes + 1);
> +	swnodes->nodes = (struct software_node *)(swnodes->ports + port_count);
> +	swnodes->nodeptrs = (const struct software_node **)(swnodes->nodes + 1 +
> +				2 * port_count);
> +	swnodes->num_ports = port_count;
> +
> +	for (i = 0; i < 2 * port_count + 1; i++)
> +		swnodes->nodeptrs[i] = &swnodes->nodes[i];
> +
> +	swnodes->nodeptrs[i] = NULL;
> +
> +	for (i = 0; i < port_count; i++)
> +		swnodes->ports[i].port_nr = NO_CSI2_PORT;
> +
> +	csi2->swnodes = swnodes;
> +	return;
> +
> +overflow:
> +	acpi_handle_info(csi2->handle, "too many _CRS CSI-2 resource handles (%zu)",
> +			 port_count);

I'd move this to where the conditions are, they can be merged.

-- 
Regards,

Sakari Ailus