Re: [PATCH v5 3/9] irqchip/imx-irqsteer: Validate IRQ count before creating domain

On Fri, Aug 21, 2026 at 07:10:33PM +0900, [email protected] wrote:
> From: Fabio Estevam <[email protected]>
>
> The IRQ count is validated after creating the IRQ domain. If it is
> invalid, probe returns without removing the domain, leaving its host
> data pointing at devm-managed memory that is freed on probe failure.
>
> Validate the count before allocating resources to avoid the leak and
> dangling pointer.
>
> Fixes: 28528fca4908 ("irqchip/imx-irqsteer: Add multi output interrupts support")
> Signed-off-by: Fabio Estevam <[email protected]>
> Signed-off-by: Zhipeng Wang <[email protected]>
> ---

This patch should be second patch.  After move to second patch, some error
handle will be nice to have.

your 3 patch needn't because no error after it. change to devm_ version
will be improvement patch and put after new API added.

Frank


>  drivers/irqchip/irq-imx-irqsteer.c | 7 ++-----
>  1 file changed, 2 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/irqchip/irq-imx-irqsteer.c b/drivers/irqchip/irq-imx-irqsteer.c
> index c1df84551efa..571324de8bd1 100644
> --- a/drivers/irqchip/irq-imx-irqsteer.c
> +++ b/drivers/irqchip/irq-imx-irqsteer.c
> @@ -218,6 +218,8 @@ static int imx_irqsteer_probe(struct platform_device *pdev)
>  	 */
>  	data->irq_count = DIV_ROUND_UP(irqs_num, 64);
>  	data->reg_num = irqs_num / 32;
> +	if (!data->irq_count || data->irq_count > CHAN_MAX_OUTPUT_INT)
> +		return -EINVAL;
>
>  	if (IS_ENABLED(CONFIG_PM)) {
>  		data->saved_reg = devm_kzalloc(&pdev->dev,
> @@ -253,11 +255,6 @@ static int imx_irqsteer_probe(struct platform_device *pdev)
>  	}
>  	irq_domain_set_pm_device(data->domain, &pdev->dev);
>
> -	if (!data->irq_count || data->irq_count > CHAN_MAX_OUTPUT_INT) {
> -		ret = -EINVAL;
> -		goto out;
> -	}
> -
>  	for (i = 0; i < data->irq_count; i++) {
>  		data->irq[i] = irq_of_parse_and_map(np, i);
>  		if (!data->irq[i])
> --
> 2.34.1
>
>