[tip:irq/urgent] irqchip/mbigen: Fix potential NULL dereferencing

tip-bot for Hanjun Guo
2017-05-12T08:37:25Z

Commit-ID: ad7cc3c0c57d77b442db323056354d0e49833569
Gitweb: http://git.kernel.org/tip/ad7cc3c0c57d77b442db323056354d0e49833569
Author: Hanjun Guo <hanjun.guo@linaro.org>
AuthorDate: Fri, 12 May 2017 11:55:27 +0800
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitDate: Fri, 12 May 2017 10:25:37 +0200

irqchip/mbigen: Fix potential NULL dereferencing

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

Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: linuxarm@huawei.com
Cc: Wei Yongjun <weiyongjun1@huawei.com>
Cc: MaJun <majun258@huawei.com>
Link: http://lkml.kernel.org/r/1494561328-39514-3-git-send-email-guohanjun@huawei.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

---
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) {