Fix an issue with the 32-bit range error path in `rtc_hctosys' where no error code is set and consequently the successful preceding call result from `rtc_read_time' is propagated to `rtc_hctosys_ret'. This in turn makes any subsequent call to `hctosys_show' incorrectly report in sysfs that the system time has been set from this RTC while it has not.
Set the error to ERANGE then if we can't express the result due to an overflow.
Signed-off-by: Maciej W. Rozycki macro@linux-mips.org Fixes: b3a5ac42ab18 ("rtc: hctosys: Ensure system time doesn't overflow time_t") Cc: stable@vger.kernel.org # 4.17+ --- drivers/rtc/hctosys.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
linux-rtc-hctosys-range.diff Index: linux-20181008-swarm64-eb/drivers/rtc/hctosys.c =================================================================== --- linux-20181008-swarm64-eb.orig/drivers/rtc/hctosys.c +++ linux-20181008-swarm64-eb/drivers/rtc/hctosys.c @@ -50,8 +50,10 @@ static int __init rtc_hctosys(void) tv64.tv_sec = rtc_tm_to_time64(&tm);
#if BITS_PER_LONG == 32 - if (tv64.tv_sec > INT_MAX) + if (tv64.tv_sec > INT_MAX) { + err = -ERANGE; goto err_read; + } #endif
err = do_settimeofday64(&tv64);