From bca05f6f39cdb5325cd89db20a3ab3959645f332 Mon Sep 17 00:00:00 2001
From: haramjeong <04harams77@gmail.com>
Date: Wed, 8 Oct 2025 15:38:07 +0900
Subject: [PATCH 1/5] buffer: throw RangeError on atob overflow

---
 lib/buffer.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/buffer.js b/lib/buffer.js
index c9f45d333886d3..0e7e9b7e33e2a8 100644
--- a/lib/buffer.js
+++ b/lib/buffer.js
@@ -37,6 +37,7 @@ const {
   ObjectDefineProperty,
   ObjectPrototypeHasOwnProperty,
   ObjectSetPrototypeOf,
+  RangeError,
   RegExpPrototypeSymbolReplace,
   StringPrototypeCharCodeAt,
   StringPrototypeSlice,
@@ -1303,8 +1304,7 @@ function atob(input) {
         'The string to be decoded is not correctly encoded.',
         'InvalidCharacterError');
     case -3: // Possible overflow
-      // TODO(@anonrig): Throw correct error in here.
-      throw lazyDOMException('The input causes overflow.', 'InvalidCharacterError');
+      throw new RangeError('The string to be decoded is too long.');
     default:
       return result;
   }

From eb77eb7b46dbd32a5bc3439f608f57c073ecb843 Mon Sep 17 00:00:00 2001
From: haramjeong <04harams77@gmail.com>
Date: Wed, 8 Oct 2025 15:50:31 +0900
Subject: [PATCH 2/5] buffer: fix lint-js

---
 lib/buffer.js | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/lib/buffer.js b/lib/buffer.js
index 0e7e9b7e33e2a8..655e3843e75acb 100644
--- a/lib/buffer.js
+++ b/lib/buffer.js
@@ -37,7 +37,6 @@ const {
   ObjectDefineProperty,
   ObjectPrototypeHasOwnProperty,
   ObjectSetPrototypeOf,
-  RangeError,
   RegExpPrototypeSymbolReplace,
   StringPrototypeCharCodeAt,
   StringPrototypeSlice,
@@ -1304,7 +1303,7 @@ function atob(input) {
         'The string to be decoded is not correctly encoded.',
         'InvalidCharacterError');
     case -3: // Possible overflow
-      throw new RangeError('The string to be decoded is too long.');
+      throw new ERR_INVALID_ARG_VALUE('input', result, 'The string to be decoded is too long.');
     default:
       return result;
   }

From cb09cba602c87d99bf656e3b9a24ac54d82964a9 Mon Sep 17 00:00:00 2001
From: Haram Jeong <91401364+haramj@users.noreply.github.com>
Date: Sun, 12 Oct 2025 14:41:06 +0900
Subject: [PATCH 3/5] buffer: remove unreachable overflow check in atob

---
 lib/buffer.js | 2 --
 1 file changed, 2 deletions(-)

diff --git a/lib/buffer.js b/lib/buffer.js
index 655e3843e75acb..c955bb931bad69 100644
--- a/lib/buffer.js
+++ b/lib/buffer.js
@@ -1302,8 +1302,6 @@ function atob(input) {
       throw lazyDOMException(
         'The string to be decoded is not correctly encoded.',
         'InvalidCharacterError');
-    case -3: // Possible overflow
-      throw new ERR_INVALID_ARG_VALUE('input', result, 'The string to be decoded is too long.');
     default:
       return result;
   }

From a54015abf1a8daa048c0a706603d965397970cec Mon Sep 17 00:00:00 2001
From: haramjeong <04harams77@gmail.com>
Date: Mon, 13 Oct 2025 10:01:37 +0900
Subject: [PATCH 4/5] buffer: add assert.fail()

---
 lib/buffer.js | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/buffer.js b/lib/buffer.js
index c955bb931bad69..af9d104f42786c 100644
--- a/lib/buffer.js
+++ b/lib/buffer.js
@@ -99,6 +99,8 @@ const {
   inspect: utilInspect,
 } = require('internal/util/inspect');
 
+const assert = require('internal/assert');
+
 const {
   codes: {
     ERR_BUFFER_OUT_OF_BOUNDS,
@@ -1302,6 +1304,8 @@ function atob(input) {
       throw lazyDOMException(
         'The string to be decoded is not correctly encoded.',
         'InvalidCharacterError');
+    case -3:
+      assert.fail('Unrecognized simdutf error');
     default:
       return result;
   }

From f5c78ba6d3755cccd968bef88259864b5baf987d Mon Sep 17 00:00:00 2001
From: haramjeong <04harams77@gmail.com>
Date: Mon, 13 Oct 2025 10:08:52 +0900
Subject: [PATCH 5/5] buffer: fix lint error

---
 lib/buffer.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/buffer.js b/lib/buffer.js
index af9d104f42786c..7cce07ddc5d410 100644
--- a/lib/buffer.js
+++ b/lib/buffer.js
@@ -1306,6 +1306,7 @@ function atob(input) {
         'InvalidCharacterError');
     case -3:
       assert.fail('Unrecognized simdutf error');
+      break;
     default:
       return result;
   }