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SubjectRe: [PATCH] irqchip/stm32: fix init error handling
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oh yes, host_data is dereferenced (for kfree into out_free_mem) if 
stm32_exti_host_init fail

thanks Dan

BR
Ludo

On 08/08/2018 02:03 PM, Dan Carpenter wrote:
> If there are any errors in stm32_exti_host_init() then it leads to a
> NULL dereference in the callers. The function should clean up after
> itself.
>
> Fixes: f9fc1745501e ("irqchip/stm32: Add host and driver data structures")
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>

Reviewed-by: Ludovic Barre <ludovic.barre@st.com>

>
> diff --git a/drivers/irqchip/irq-stm32-exti.c b/drivers/irqchip/irq-stm32-exti.c
> index 3df527fcf4e1..0a2088e12d96 100644
> --- a/drivers/irqchip/irq-stm32-exti.c
> +++ b/drivers/irqchip/irq-stm32-exti.c
> @@ -603,17 +603,24 @@ stm32_exti_host_data *stm32_exti_host_init(const struct stm32_exti_drv_data *dd,
> sizeof(struct stm32_exti_chip_data),
> GFP_KERNEL);
> if (!host_data->chips_data)
> - return NULL;
> + goto free_host_data;
>
> host_data->base = of_iomap(node, 0);
> if (!host_data->base) {
> pr_err("%pOF: Unable to map registers\n", node);
> - return NULL;
> + goto free_chips_data;
> }
>
> stm32_host_data = host_data;
>
> return host_data;
> +
> +free_chips_data:
> + kfree(host_data->chips_data);
> +free_host_data:
> + kfree(host_data);
> +
> + return NULL;
> }
>
> static struct
> @@ -665,10 +672,8 @@ static int __init stm32_exti_init(const struct stm32_exti_drv_data *drv_data,
> struct irq_domain *domain;
>
> host_data = stm32_exti_host_init(drv_data, node);
> - if (!host_data) {
> - ret = -ENOMEM;
> - goto out_free_mem;
> - }
> + if (!host_data)
> + return -ENOMEM;
>
> domain = irq_domain_add_linear(node, drv_data->bank_nr * IRQS_PER_BANK,
> &irq_exti_domain_ops, NULL);
> @@ -725,7 +730,6 @@ static int __init stm32_exti_init(const struct stm32_exti_drv_data *drv_data,
> irq_domain_remove(domain);
> out_unmap:
> iounmap(host_data->base);
> -out_free_mem:
> kfree(host_data->chips_data);
> kfree(host_data);
> return ret;
> @@ -752,10 +756,8 @@ __init stm32_exti_hierarchy_init(const struct stm32_exti_drv_data *drv_data,
> }
>
> host_data = stm32_exti_host_init(drv_data, node);
> - if (!host_data) {
> - ret = -ENOMEM;
> - goto out_free_mem;
> - }
> + if (!host_data)
> + return -ENOMEM;
>
> for (i = 0; i < drv_data->bank_nr; i++)
> stm32_exti_chip_init(host_data, i, node);
> @@ -777,7 +779,6 @@ __init stm32_exti_hierarchy_init(const struct stm32_exti_drv_data *drv_data,
>
> out_unmap:
> iounmap(host_data->base);
> -out_free_mem:
> kfree(host_data->chips_data);
> kfree(host_data);
> return ret;
>

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