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rtc: digicolor: fix possible race condition 

The IRQ is requested before the struct rtc is allocated and registered, but
this struct is used in the IRQ handler. This may lead to a NULL pointer
dereference.

Switch to devm_rtc_allocate_device/rtc_register_device to allocate the rtc
struct before requesting the IRQ.

Acked-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Alexandre Belloni 2019-04-30 11:32:09 +02:00
parent 86836d641d
commit 060711f527
1 changed files with 7 additions and 5 deletions
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12
drivers/rtc/rtc-digicolor.c
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@ -192,6 +192,10 @@ static int __init dc_rtc_probe(struct platform_device *pdev)
if (IS_ERR(rtc->regs))
return PTR_ERR(rtc->regs);
rtc->rtc_dev = devm_rtc_allocate_device(&pdev->dev);
if (IS_ERR(rtc->rtc_dev))
return PTR_ERR(rtc->rtc_dev);
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
@ -200,12 +204,10 @@ static int __init dc_rtc_probe(struct platform_device *pdev)
return ret;
platform_set_drvdata(pdev, rtc);
rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, pdev->name,
&dc_rtc_ops, THIS_MODULE);
if (IS_ERR(rtc->rtc_dev))
return PTR_ERR(rtc->rtc_dev);
return 0;
rtc->rtc_dev->ops = &dc_rtc_ops;
return rtc_register_device(rtc->rtc_dev);
}
static const struct of_device_id dc_dt_ids[] = {