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LibJS: Protect YearFromTime against non-finite times

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Timothy Flynn 2022-01-15 17:37:36 -05:00 committed by Andreas Kling
parent 8ad043fe5e
commit 9be0a0fd28
Notes: sideshowbarker 2024-07-17 20:47:35 +09:00 
Author: https://github.com/trflynn89
Commit: https://github.com/SerenityOS/serenity/commit/9be0a0fd28a
Pull-request: https://github.com/SerenityOS/serenity/pull/11930
Reviewed-by: https://github.com/linusg ✅
1 changed files with 3 additions and 0 deletions
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3
Userland/Libraries/LibJS/Runtime/Date.cpp
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@ -5,6 +5,7 @@
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/NumericLimits.h>
#include <AK/StringBuilder.h>
#include <AK/Time.h>
#include <LibCore/DateTime.h>
@ -147,6 +148,8 @@ double time_from_year(i32 y)
i32 year_from_time(double t)
{
// the largest integral Number y (closest to +∞) such that TimeFromYear(y) ≤ t
if (!Value(t).is_finite_number())
return NumericLimits<i32>::max();
// Approximation using average number of milliseconds per year. We might have to adjust this guess afterwards.
auto year = static_cast<i32>(t / (365.2425 * Date::ms_per_day) + 1970);