Hi Nick,
On 10/09/2019 16:19:29+0100, Nick Crews wrote:
> Check that the time received from the RTC HW is valid,
> otherwise the computation of rtc_year_days() in the next
> line could, and sometimes does, crash the kernel.
>
> While we're at it, fix the license to plain "GPL".
>
> Signed-off-by: Nick Crews <ncr...@chromium.org>
> ---
> drivers/rtc/rtc-wilco-ec.c | 12 ++++++++++--
> 1 file changed, 10 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/rtc/rtc-wilco-ec.c b/drivers/rtc/rtc-wilco-ec.c
> index 8ad4c4e6d557..0ccbf2dce832 100644
> --- a/drivers/rtc/rtc-wilco-ec.c
> +++ b/drivers/rtc/rtc-wilco-ec.c
> @@ -110,8 +110,16 @@ static int wilco_ec_rtc_read(struct device *dev, struct
> rtc_time *tm)
> tm->tm_mday = rtc.day;
> tm->tm_mon = rtc.month - 1;
> tm->tm_year = rtc.year + (rtc.century * 100) - 1900;
> - tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year);
If your driver doesn't care about yday, userspace doesn't either. You
can simply not set it.
>
> + if (rtc_valid_tm(tm)) {
> + dev_warn(dev,
> + "Time computed from EC RTC is invalid: sec=%d, min=%d,
> hour=%d, mday=%d, mon=%d, year=%d",
> + tm->tm_sec, tm->tm_min, tm->tm_hour, tm->mday,
> + tm->mon, tm->year);
> + return -EIO;
> + }
> +
> + tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year);
> /* Don't compute day of week, we don't need it. */
> tm->tm_wday = -1;
>
> @@ -188,5 +196,5 @@ module_platform_driver(wilco_ec_rtc_driver);
>
> MODULE_ALIAS("platform:rtc-wilco-ec");
> MODULE_AUTHOR("Nick Crews <ncr...@chromium.org>");
> -MODULE_LICENSE("GPL v2");
> +MODULE_LICENSE("GPL");
This should be in a separate patch.
> MODULE_DESCRIPTION("Wilco EC RTC driver");
> --
> 2.11.0
>
--
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
