From 7fc78f66102316e513c04d770b4535ded72bac9a Mon Sep 17 00:00:00 2001
From: neeldug <5161147+neeldug@users.noreply.github.com>
Date: Sat, 21 Aug 2021 20:27:56 +0100
Subject: [PATCH] fix(boa): fixes panic on bigint size (#1415)

---
 boa/src/bigint.rs | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/boa/src/bigint.rs b/boa/src/bigint.rs
index c6330d20ab..2e2bca1d58 100644
--- a/boa/src/bigint.rs
+++ b/boa/src/bigint.rs
@@ -169,6 +169,15 @@ impl JsBigInt {
             return Err(context.construct_range_error("BigInt negative exponent"));
         };
 
+        let num_bits = (x.inner.bits() as f64
+            * y.to_f64().expect("Unable to convert from BigUInt to f64"))
+        .floor()
+            + 1f64;
+
+        if num_bits > 1_000_000_000f64 {
+            return Err(context.construct_range_error("Maximum BigInt size exceeded"));
+        }
+
         Ok(Self::new(x.inner.as_ref().clone().pow(y)))
     }