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genirq: Check irq_data_get_irq_chip() return value before use

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irq_data_get_irq_chip() can return NULL, however it is expected that this
never happens. If a buggy driver leads to NULL being returned from
irq_data_get_irq_chip(), warn about it instead of crashing the machine.

Signed-off-by: Marek Vasut <marex@denx.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

To: linux-arm-kernel@lists.infradead.org
This commit is contained in:
Marek Vasut 2020-05-14 02:25:55 +02:00 committed by Thomas Gleixner
parent 9cb1fd0efd
commit 1d0326f352
1 changed files with 4 additions and 0 deletions
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4
kernel/irq/manage.c
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@ -2619,6 +2619,8 @@ int __irq_get_irqchip_state(struct irq_data *data, enum irqchip_irq_state which,
do {
chip = irq_data_get_irq_chip(data);
if (WARN_ON_ONCE(!chip))
return -ENODEV;
if (chip->irq_get_irqchip_state)
break;
#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
@ -2696,6 +2698,8 @@ int irq_set_irqchip_state(unsigned int irq, enum irqchip_irq_state which,
do {
chip = irq_data_get_irq_chip(data);
if (WARN_ON_ONCE(!chip))
return -ENODEV;
if (chip->irq_set_irqchip_state)
break;
#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY