[PATCH -next] irqchip/tango: Fix potential NULL pointer dereference

[YueHaibing]

There is a potential NULL pointer dereference in case kzalloc()
fails and returns NULL.

Fixes: 4bba66899ac6 ("irqchip/tango: Add support for Sigma Designs 
SMP86xx/SMP87xx interrupt controller")
Signed-off-by: YueHaibing <yuehaib...@huawei.com>
---
 drivers/irqchip/irq-tango.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/irqchip/irq-tango.c b/drivers/irqchip/irq-tango.c
index ae28d86..a63b828 100644
--- a/drivers/irqchip/irq-tango.c
+++ b/drivers/irqchip/irq-tango.c
@@ -191,6 +191,8 @@ static int __init tangox_irq_init(void __iomem *base, 
struct resource *baseres,
                panic("%pOFn: failed to get address", node);
 
        chip = kzalloc(sizeof(*chip), GFP_KERNEL);
+       if (!chip)
+               return -ENOMEM;
        chip->ctl = res.start - baseres->start;
        chip->base = base;
 
-- 
2.7.0