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LibJS: Protect LocalTZA against non-finite times

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It is undefined behavior to cast from a double to an integer if the
value does not fit in the limits of the integer.
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Timothy Flynn 2022-01-15 10:18:58 -05:00 committed by Linus Groh
parent b2aa3c9f84
commit 62dc9958f5
1 changed files with 2 additions and 1 deletions
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3
Userland/Libraries/LibJS/Runtime/Date.cpp
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@ -331,7 +331,8 @@ double local_tza(double time, [[maybe_unused]] bool is_utc, Optional<StringView>
// UTC measured in milliseconds at local time represented by Number tlocal. When the result is subtracted
// from tlocal, it should yield the corresponding time value tUTC.
auto maybe_offset = TimeZone::get_time_zone_offset(time_zone, AK::Time::from_milliseconds(time));
auto time_since_epoch = Value(time).is_finite_number() ? AK::Time::from_milliseconds(time) : AK::Time::max();
auto maybe_offset = TimeZone::get_time_zone_offset(time_zone, time_since_epoch);
return maybe_offset.value_or(0) * 1000;
}