[PATCH 1/6] rtc: 88pm860x: fix possible race condition

From: Alexandre Belloni
Date: Wed Mar 11 2020 - 18:40:13 EST


The RTC IRQ is requested before the struct rtc_device is allocated,
this may lead to a NULL pointer dereference in the IRQ handler.

To fix this issue, allocating the rtc_device struct before requesting
the RTC IRQ using devm_rtc_allocate_device, and use rtc_register_device
to register the RTC device.

Also remove the unnecessary error message as the core already prints the
info.

Signed-off-by: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxx>
---
drivers/rtc/rtc-88pm860x.c | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/rtc/rtc-88pm860x.c b/drivers/rtc/rtc-88pm860x.c
index 4743b16a8d84..1526402e126b 100644
--- a/drivers/rtc/rtc-88pm860x.c
+++ b/drivers/rtc/rtc-88pm860x.c
@@ -336,6 +336,10 @@ static int pm860x_rtc_probe(struct platform_device *pdev)
info->dev = &pdev->dev;
dev_set_drvdata(&pdev->dev, info);

+ info->rtc_dev = devm_rtc_allocate_device(&pdev->dev);
+ if (IS_ERR(info->rtc_dev))
+ return PTR_ERR(info->rtc_dev);
+
ret = devm_request_threaded_irq(&pdev->dev, info->irq, NULL,
rtc_update_handler, IRQF_ONESHOT, "rtc",
info);
@@ -377,13 +381,11 @@ static int pm860x_rtc_probe(struct platform_device *pdev)
}
}

- info->rtc_dev = devm_rtc_device_register(&pdev->dev, "88pm860x-rtc",
- &pm860x_rtc_ops, THIS_MODULE);
- ret = PTR_ERR(info->rtc_dev);
- if (IS_ERR(info->rtc_dev)) {
- dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
+ info->rtc_dev->ops = &pm860x_rtc_ops;
+
+ ret = rtc_register_device(info->rtc_dev);
+ if (ret)
return ret;
- }

/*
* enable internal XO instead of internal 3.25MHz clock since it can
--
2.24.1