diff options
| author | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2018-09-09 22:38:47 +0200 |
|---|---|---|
| committer | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2018-09-11 13:56:35 +0200 |
| commit | c778ec85825dc895936940072aea9fe9037db684 (patch) | |
| tree | d108049408d31e0038e0155a496320c325dcb7b2 | |
| parent | babab2f86440352d24e76118fdd7d40cab5fd7bf (diff) | |
| download | linux-c778ec85825dc895936940072aea9fe9037db684.tar.bz2 | |
rtc: pl030: 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>
| -rw-r--r-- | drivers/rtc/rtc-pl030.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/drivers/rtc/rtc-pl030.c b/drivers/rtc/rtc-pl030.c index f85a1a93e669..343bb6ed1783 100644 --- a/drivers/rtc/rtc-pl030.c +++ b/drivers/rtc/rtc-pl030.c @@ -112,6 +112,13 @@ static int pl030_probe(struct amba_device *dev, const struct amba_id *id) goto err_rtc; } + rtc->rtc = devm_rtc_allocate_device(&dev->dev); + if (IS_ERR(rtc->rtc)) { + ret = PTR_ERR(rtc->rtc); + goto err_rtc; + } + + rtc->rtc->ops = &pl030_ops; rtc->base = ioremap(dev->res.start, resource_size(&dev->res)); if (!rtc->base) { ret = -ENOMEM; @@ -128,12 +135,9 @@ static int pl030_probe(struct amba_device *dev, const struct amba_id *id) if (ret) goto err_irq; - rtc->rtc = rtc_device_register("pl030", &dev->dev, &pl030_ops, - THIS_MODULE); - if (IS_ERR(rtc->rtc)) { - ret = PTR_ERR(rtc->rtc); + ret = rtc_register_device(rtc->rtc); + if (ret) goto err_reg; - } return 0; @@ -154,7 +158,6 @@ static int pl030_remove(struct amba_device *dev) writel(0, rtc->base + RTC_CR); free_irq(dev->irq[0], rtc); - rtc_device_unregister(rtc->rtc); iounmap(rtc->base); amba_release_regions(dev); |