[PATCH v2 2/3] irqchip/mbigen: Fix potential NULL dereferencing

[Hanjun Guo]

From: Hanjun Guo <hanjun....@linaro.org>

platform_get_resource() may return NULL, add proper
check to avoid potential NULL dereferencing.

Signed-off-by: Hanjun Guo <hanjun....@linaro.org>
---
 drivers/irqchip/irq-mbigen.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/irqchip/irq-mbigen.c b/drivers/irqchip/irq-mbigen.c
index 0f5e66e..2fa1e45 100644
--- a/drivers/irqchip/irq-mbigen.c
+++ b/drivers/irqchip/irq-mbigen.c
@@ -337,6 +337,9 @@ static int mbigen_device_probe(struct platform_device *pdev)
        mgn_chip->pdev = pdev;
 
        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       if (!res)
+               return -EINVAL;
+
        mgn_chip->base = devm_ioremap(&pdev->dev, res->start,
                                      resource_size(res));
        if (!mgn_chip->base) {
-- 
1.7.12.4