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irqchip/stm32: Fix init error handling 

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: f9fc174550 ("irqchip/stm32: Add host and driver data structures")
Reviewed-by: Ludovic Barre <ludovic.barre@st.com>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Dan Carpenter 2018-08-08 15:03:19 +03:00 committed by Marc Zyngier
parent 0702bc4d2f
commit 4096165d55
1 changed files with 13 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
drivers/irqchip/irq-stm32-exti.c
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@ -602,17 +602,24 @@ 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
@ -664,10 +671,8 @@ 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);
@ -724,7 +729,6 @@ out_free_domain:
irq_domain_remove(domain);
out_unmap:
iounmap(host_data->base);
out_free_mem:
kfree(host_data->chips_data);
kfree(host_data);
return ret;
@ -751,10 +755,8 @@ __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);
@ -776,7 +778,6 @@ __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;