| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.10 59/74] rtc: cmos: Evaluate century appropriate | Date | Mon, 7 Feb 2022 12:06:57 +0100 |
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From: Riwen Lu <luriwen@kylinos.cn>
commit ff164ae39b82ee483b24579c8e22a13a8ce5bd04 upstream.
There's limiting the year to 2069. When setting the rtc year to 2070, reading it returns 1970. Evaluate century starting from 19 to count the correct year.
$ sudo date -s 20700106 Mon 06 Jan 2070 12:00:00 AM CST $ sudo hwclock -w $ sudo hwclock -r 1970-01-06 12:00:49.604968+08:00
Fixes: 2a4daadd4d3e5071 ("rtc: cmos: ignore bogus century byte")
Signed-off-by: Riwen Lu <luriwen@kylinos.cn> Acked-by: Eric Wong <e@80x24.org> Reviewed-by: Mateusz Jończyk <mat.jonczyk@o2.pl> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Link: https://lore.kernel.org/r/20220106084609.1223688-1-luriwen@kylinos.cn Signed-off-by: Mateusz Jończyk <mat.jonczyk@o2.pl> # preparation for stable Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- drivers/rtc/rtc-mc146818-lib.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/rtc/rtc-mc146818-lib.c +++ b/drivers/rtc/rtc-mc146818-lib.c @@ -83,7 +83,7 @@ unsigned int mc146818_get_time(struct rt time->tm_year += real_year - 72; #endif - if (century > 20) + if (century > 19) time->tm_year += (century - 19) * 100; /*
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