fs: harden filehandle.read(params) typecheck

Make sure that first argument is a nullable object

Co-authored-by: Antoine du Hamel <[email protected]>
PR-URL: #42772
Reviewed-By: Antoine du Hamel <[email protected]>
Reviewed-By: James M Snell <[email protected]>

Author: 2 people

lib/internal/fs/promises.js

@@ -77,6 +77,7 @@ const {
   validateBuffer,
   validateEncoding,
   validateInteger,
+  validateObject,
   validateString,
 } = require('internal/validators');
 const pathModule = require('path');
@@ -517,6 +518,9 @@ async function read(handle, bufferOrParams, offset, length, position) {
   let buffer = bufferOrParams;
   if (!isArrayBufferView(buffer)) {
     // This is fh.read(params)
+    if (bufferOrParams !== undefined) {
+      validateObject(bufferOrParams, 'options', { nullable: true });
+    }
     ({
       buffer = Buffer.alloc(16384),
       offset = 0,

test/parallel/test-fs-promises.js

@@ -153,14 +153,24 @@ async function executeOnHandle(dest, func) {
       });
     }
 
-    // Use fallback buffer allocation when input not buffer
+    // Use fallback buffer allocation when first argument is null
     {
       await executeOnHandle(dest, async (handle) => {
-        const ret = await handle.read(0, 0, 0, 0);
+        const ret = await handle.read(null, 0, 0, 0);
         assert.strictEqual(ret.buffer.length, 16384);
       });
     }
 
+    // TypeError if buffer is not ArrayBufferView or nullable object
+    {
+      await executeOnHandle(dest, async (handle) => {
+        await assert.rejects(
+          async () => handle.read(0, 0, 0, 0),
+          { code: 'ERR_INVALID_ARG_TYPE' }
+        );
+      });
+    }
+
     // Bytes written to file match buffer
     {
       await executeOnHandle(dest, async (handle) => {