From 2e9f665bda041ad2e9ee70ecabbaf96a18a7a2ec Mon Sep 17 00:00:00 2001
From: Idan Horowitz <idan.horowitz@gmail.com>
Date: Thu, 17 Jun 2021 18:27:48 +0300
Subject: [PATCH] LibJS: Throw on detached viewed ArrayBuffer when validating
 TypedArrays

---
 Userland/Libraries/LibJS/Runtime/TypedArrayPrototype.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/Userland/Libraries/LibJS/Runtime/TypedArrayPrototype.cpp b/Userland/Libraries/LibJS/Runtime/TypedArrayPrototype.cpp
index f5e559697a..e438a069db 100644
--- a/Userland/Libraries/LibJS/Runtime/TypedArrayPrototype.cpp
+++ b/Userland/Libraries/LibJS/Runtime/TypedArrayPrototype.cpp
@@ -53,7 +53,12 @@ static TypedArrayBase* typed_array_from(VM& vm, GlobalObject& global_object)
         vm.throw_exception<TypeError>(global_object, ErrorType::NotA, "TypedArray");
         return nullptr;
     }
-    return static_cast<TypedArrayBase*>(this_object);
+    auto* typed_array = static_cast<TypedArrayBase*>(this_object);
+    if (typed_array->viewed_array_buffer()->is_detached()) {
+        vm.throw_exception<TypeError>(global_object, ErrorType::DetachedArrayBuffer);
+        return nullptr;
+    }
+    return typed_array;
 }
 
 static Function* callback_from_args(GlobalObject& global_object, const String& name)