fs: fix pre-aborted writeFile AbortSignal file leak

Fix an issue in writeFile where a file is opened, and not closed
if the abort signal is aborted after the file was opened
but before writing began.

Author: Nitzan Uziely

lib/internal/fs/promises.js

@@ -66,6 +66,7 @@ const {
 const { opendir } = require('internal/fs/dir');
 const {
   parseFileMode,
+  validateAbortSignal,
   validateBoolean,
   validateBuffer,
   validateInteger,
@@ -668,13 +669,15 @@ async function writeFile(path, data, options) {
     data = Buffer.from(data, options.encoding || 'utf8');
   }
 
+  validateAbortSignal(options.signal);
   if (path instanceof FileHandle)
     return writeFileHandle(path, data, options.signal);
 
-  const fd = await open(path, flag, options.mode);
   if (options.signal?.aborted) {
     throw lazyDOMException('The operation was aborted', 'AbortError');
   }
+
+  const fd = await open(path, flag, options.mode);
   return PromisePrototypeFinally(writeFileHandle(fd, data), fd.close);
 }
 
@@ -692,6 +695,10 @@ async function readFile(path, options) {
   if (path instanceof FileHandle)
     return readFileHandle(path, options);
 
+  if (options.signal?.aborted) {
+    throw lazyDOMException('The operation was aborted', 'AbortError');
+  }
+
   const fd = await open(path, flag, 0o666);
   return PromisePrototypeFinally(readFileHandle(fd, options), fd.close);
 }