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| author | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2019-03-03 22:24:44 +0100 |
|---|---|---|
| committer | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2019-03-03 22:36:19 +0100 |
| commit | b8541798a8a6a288cb2f5c540bf5270e118c0b0c (patch) | |
| tree | 553031add6f3c275124cac1c52df61bce7527b57 /drivers/rtc/rtc-zynqmp.c | |
| parent | rtc: imx-sc: use rtc_time64_to_tm (diff) | |
| download | linux-b8541798a8a6a288cb2f5c540bf5270e118c0b0c.tar.xz linux-b8541798a8a6a288cb2f5c540bf5270e118c0b0c.zip | |
rtc: zynqmp: 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
struct before requesting the IRQ.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Diffstat (limited to 'drivers/rtc/rtc-zynqmp.c')
| -rw-r--r-- | drivers/rtc/rtc-zynqmp.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/drivers/rtc/rtc-zynqmp.c b/drivers/rtc/rtc-zynqmp.c index c532bd13fbe5..f0dd20785b54 100644 --- a/drivers/rtc/rtc-zynqmp.c +++ b/drivers/rtc/rtc-zynqmp.c @@ -222,6 +222,12 @@ static int xlnx_rtc_probe(struct platform_device *pdev) platform_set_drvdata(pdev, xrtcdev); + xrtcdev->rtc = devm_rtc_allocate_device(&pdev->dev); + if (IS_ERR(xrtcdev->rtc)) + return PTR_ERR(xrtcdev->rtc); + + xrtcdev->rtc->ops = &xlnx_rtc_ops; + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); xrtcdev->reg_base = devm_ioremap_resource(&pdev->dev, res); @@ -263,9 +269,7 @@ static int xlnx_rtc_probe(struct platform_device *pdev) device_init_wakeup(&pdev->dev, 1); - xrtcdev->rtc = devm_rtc_device_register(&pdev->dev, pdev->name, - &xlnx_rtc_ops, THIS_MODULE); - return PTR_ERR_OR_ZERO(xrtcdev->rtc); + return rtc_register_device(xrtcdev->rtc); } static int xlnx_rtc_remove(struct platform_device *pdev) |