phy: ocelot-serdes: fix out-of-bounds read

Currently, there is an out-of-bounds read on array ctrl->phys,
once variable i reaches the maximum array size of SERDES_MAX
in the for loop.

Fix this by changing the condition in the for loop from
i <= SERDES_MAX to i < SERDES_MAX.

Addresses-Coverity-ID: 1473966 ("Out-of-bounds read")
Addresses-Coverity-ID: 1473959 ("Out-of-bounds read")
Fixes: 51f6b410fc22 ("phy: add driver for Microsemi Ocelot SerDes muxing")
Reviewed-by: Quentin Schulz <quentin.schulz@bootlin.com>
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
static int serdes_probe(struct platform_device *pdev)
{
	struct phy_provider *provider;
	struct serdes_ctrl *ctrl;
	unsigned int i;
	int ret;

	ctrl = devm_kzalloc(&pdev->dev, sizeof(*ctrl), GFP_KERNEL);
	if (!ctrl)
		return -ENOMEM;

	ctrl->dev = &pdev->dev;
	ctrl->regs = syscon_node_to_regmap(pdev->dev.parent->of_node);
 	if (IS_ERR(ctrl->regs))
 		return PTR_ERR(ctrl->regs);
 
	for (i = 0; i < SERDES_MAX; i++) {
 		ret = serdes_phy_create(ctrl, i, &ctrl->phys[i]);
 		if (ret)
 			return ret;
	}

	dev_set_drvdata(&pdev->dev, ctrl);

	provider = devm_of_phy_provider_register(ctrl->dev,
						 serdes_simple_xlate);

	return PTR_ERR_OR_ZERO(provider);
}

static int serdes_probe(struct platform_device *pdev)
{
	struct phy_provider *provider;
	struct serdes_ctrl *ctrl;
	unsigned int i;
	int ret;

	ctrl = devm_kzalloc(&pdev->dev, sizeof(*ctrl), GFP_KERNEL);
	if (!ctrl)
		return -ENOMEM;

	ctrl->dev = &pdev->dev;
	ctrl->regs = syscon_node_to_regmap(pdev->dev.parent->of_node);
 	if (IS_ERR(ctrl->regs))
 		return PTR_ERR(ctrl->regs);
 
	for (i = 0; i <= SERDES_MAX; i++) {
 		ret = serdes_phy_create(ctrl, i, &ctrl->phys[i]);
 		if (ret)
 			return ret;
	}

	dev_set_drvdata(&pdev->dev, ctrl);

	provider = devm_of_phy_provider_register(ctrl->dev,
						 serdes_simple_xlate);

	return PTR_ERR_OR_ZERO(provider);
}
