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| author | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2018-05-17 22:26:21 +0200 |
|---|---|---|
| committer | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2018-05-17 22:37:07 +0200 |
| commit | e6000a438e534ee0afd9e83b67f4e23a26dd1067 (patch) | |
| tree | 37c62ebda4ce3520c217f250a17e13b1ba28ac50 /drivers/rtc/rtc-tps65910.c | |
| parent | c402f8ead68ccd05d63f79ab729184498c3467b3 (diff) | |
| download | lwn-e6000a438e534ee0afd9e83b67f4e23a26dd1067.tar.gz lwn-e6000a438e534ee0afd9e83b67f4e23a26dd1067.zip | |
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>
Diffstat (limited to 'drivers/rtc/rtc-tps65910.c')
| -rw-r--r-- | drivers/rtc/rtc-tps65910.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/drivers/rtc/rtc-tps65910.c b/drivers/rtc/rtc-tps65910.c index d0244d7979fc..a56b526db89a 100644 --- a/drivers/rtc/rtc-tps65910.c +++ b/drivers/rtc/rtc-tps65910.c @@ -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; } |