From 806c5730492a4a2f4f259e41a4b02431c88f4001 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Juan=20Jos=C3=A9=20Arboleda?= <soyjuanarbol@gmail.com>
Date: Fri, 29 Jan 2021 13:58:18 -0500
Subject: [PATCH] lib: avoid crash on `fs.fstatSync(-0)` call

Fixes: https://github.com/nodejs/node/issues/37122
---
 lib/fs.js                     | 3 ++-
 test/parallel/test-fs-stat.js | 2 ++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/fs.js b/lib/fs.js
index d01e99c21b0178..20c99e3224414e 100644
--- a/lib/fs.js
+++ b/lib/fs.js
@@ -1099,7 +1099,8 @@ function hasNoEntryError(ctx) {
 function fstatSync(fd, options = { bigint: false, throwIfNoEntry: true }) {
   validateInt32(fd, 'fd', 0);
   const ctx = { fd };
-  const stats = binding.fstat(fd, options.bigint, undefined, ctx);
+  // The fd should be `fd | 0` just for the edgecase when `fd = -0`
+  const stats = binding.fstat(fd | 0, options.bigint, undefined, ctx);
   handleErrorFromBinding(ctx);
   return getStatsFromBinding(stats);
 }
diff --git a/test/parallel/test-fs-stat.js b/test/parallel/test-fs-stat.js
index 31aec8fab00450..abd87f53e7f85c 100644
--- a/test/parallel/test-fs-stat.js
+++ b/test/parallel/test-fs-stat.js
@@ -69,6 +69,8 @@ fs.open('.', 'r', undefined, common.mustCall(function(err, fd) {
   fs.close(fd, common.mustSucceed());
 }));
 
+assert.ok(fs.fstatSync(-0));
+
 fs.stat(__filename, common.mustSucceed((s) => {
   assert.strictEqual(s.isDirectory(), false);
   assert.strictEqual(s.isFile(), true);