From 1d0326f352bb094771df17f045bdbadff89a43e6 Mon Sep 17 00:00:00 2001 From: Marek Vasut Date: Thu, 14 May 2020 02:25:55 +0200 Subject: [PATCH] genirq: Check irq_data_get_irq_chip() return value before use 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 Signed-off-by: Thomas Gleixner To: linux-arm-kernel@lists.infradead.org --- kernel/irq/manage.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index 453a8a0..7619111 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -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 -- 2.7.4