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rtc: tps65910: 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
before requesting the IRQ.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Alexandre Belloni 2018-05-17 22:26:21 +02:00
parent c402f8ead6
commit e6000a438e
1 changed files with 8 additions and 4 deletions
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12
drivers/rtc/rtc-tps65910.c
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@ -380,6 +380,10 @@ static int tps65910_rtc_probe(struct platform_device *pdev)
if (!tps_rtc)
return -ENOMEM;
tps_rtc->rtc = devm_rtc_allocate_device(&pdev->dev);
if (IS_ERR(tps_rtc->rtc))
return PTR_ERR(tps_rtc->rtc);
/* Clear pending interrupts */
ret = regmap_read(tps65910->regmap, TPS65910_RTC_STATUS, &rtc_reg);
if (ret < 0)
@ -421,10 +425,10 @@ static int tps65910_rtc_probe(struct platform_device *pdev)
tps_rtc->irq = irq;
device_set_wakeup_capable(&pdev->dev, 1);
tps_rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
&tps65910_rtc_ops, THIS_MODULE);
if (IS_ERR(tps_rtc->rtc)) {
ret = PTR_ERR(tps_rtc->rtc);
tps_rtc->rtc->ops = &tps65910_rtc_ops;
ret = rtc_register_device(tps_rtc->rtc);
if (ret) {
dev_err(&pdev->dev, "RTC device register: err %d\n", ret);
return ret;
}