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rtc: gemini: add return value validation

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Function devm_ioremap() will return a NULL pointer if it fails to remap
IO address, and its return value should be validated before it is used.
However, in function gemini_rtc_probe(), its return value is not
checked. This may result in bad memory access bugs on future access,
e.g. calling the function gemini_rtc_read_time().

Signed-off-by: Pan Bian <bianpan2016@163.com>
Acked-by: Hans Ulli Kroll <ulli.kroll@googlemail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
This commit is contained in:
Pan Bian 2017-04-23 20:48:07 +08:00 committed by Alexandre Belloni
parent 758929005f
commit 332e0d13d3
1 changed files with 2 additions and 0 deletions
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2
drivers/rtc/rtc-gemini.c
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@ -139,6 +139,8 @@ static int gemini_rtc_probe(struct platform_device *pdev)
rtc->rtc_base = devm_ioremap(dev, res->start,
resource_size(res));
if (!rtc->rtc_base)
return -ENOMEM;
ret = devm_request_irq(dev, rtc->rtc_irq, gemini_rtc_interrupt,
IRQF_SHARED, pdev->name, dev);