From 38b8fa8f3e2f0ff0174b9cb9bd7345b74b155931 Mon Sep 17 00:00:00 2001
From: Idan Horowitz <idan.horowitz@gmail.com>
Date: Wed, 30 Jun 2021 19:50:23 +0300
Subject: [PATCH] LibJS: Ensure shift values in left_shift are modded by 32

This is equivalent to 58d6a2d0192b7860ecb2edb4aa5d36b389213a15 but for
the left shift operation.
---
 Userland/Libraries/LibJS/Runtime/Value.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Userland/Libraries/LibJS/Runtime/Value.cpp b/Userland/Libraries/LibJS/Runtime/Value.cpp
index dafa672468e..0c8742b2f07 100644
--- a/Userland/Libraries/LibJS/Runtime/Value.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Value.cpp
@@ -993,7 +993,7 @@ Value left_shift(GlobalObject& global_object, Value lhs, Value rhs)
             return lhs_numeric;
         // Ok, so this performs toNumber() again but that "can't" throw
         auto lhs_i32 = lhs_numeric.to_i32(global_object);
-        auto rhs_u32 = rhs_numeric.to_u32(global_object);
+        auto rhs_u32 = rhs_numeric.to_u32(global_object) % 32;
         return Value(lhs_i32 << rhs_u32);
     }
     if (both_bigint(lhs_numeric, rhs_numeric)) {