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| author | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2020-03-11 23:39:51 +0100 |
|---|---|---|
| committer | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2020-03-16 11:55:55 +0100 |
| commit | 9cf4789e6e4673d0b2c96fa6bb0c35e81b43111a (patch) | |
| tree | 5e7b64c19aafc2d6167cfa82d4f7f8e8c191171d /drivers/rtc/rtc-88pm860x.c | |
| parent | rtc: snvs: Use devm_add_action_or_reset() for calls to clk_disable_unprepare() (diff) | |
| download | linux-9cf4789e6e4673d0b2c96fa6bb0c35e81b43111a.tar.xz linux-9cf4789e6e4673d0b2c96fa6bb0c35e81b43111a.zip | |
rtc: 88pm860x: fix possible race condition
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.
Link: https://lore.kernel.org/r/20200311223956.51352-1-alexandre.belloni@bootlin.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Diffstat (limited to 'drivers/rtc/rtc-88pm860x.c')
| -rw-r--r-- | drivers/rtc/rtc-88pm860x.c | 14 |
1 files 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 |