mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-10-02 23:27:06 +00:00
Code Issues Releases Wiki Activity

rtc: tps65910: fix possible race condition

Browse source 
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
Show stats Download patch file Download diff file Expand all files Collapse all files

12
drivers/rtc/rtc-tps65910.c
View file

@ -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;
}