diff options
| author | Marek Vasut <marex@denx.de> | 2020-05-14 02:25:55 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2020-05-28 15:58:04 +0200 |
| commit | 1d0326f352bb094771df17f045bdbadff89a43e6 (patch) | |
| tree | 7371c341b51de7df6952adf6d9d5deeb982d83ef /kernel/irq/manage.c | |
| parent | 9cb1fd0efd195590b828b9b865421ad345a4a145 (diff) | |
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 <marex@denx.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
To: linux-arm-kernel@lists.infradead.org
Diffstat (limited to 'kernel/irq/manage.c')
| -rw-r--r-- | kernel/irq/manage.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index 453a8a0f4804..761911168438 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 |