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irqchip/mbigen: Fix potential NULL dereferencing

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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>
This commit is contained in:
Hanjun Guo 2017-05-12 11:55:27 +08:00 committed by Thomas Gleixner
parent 5ba9b0a141
commit ad7cc3c0c5
1 changed files with 3 additions and 0 deletions
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3
drivers/irqchip/irq-mbigen.c
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@ -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) {