"fs.promises.readFile" results in an abort

[zyscoder]

• Version: v14.15.1
• Platform: Linux 5.8.0-38-generic The binary and long term compatibility with node #43~20.04.1-Ubuntu SMP Tue Jan 12 16:39:47 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
• Subsystem: fs.promises.readFile

What steps will reproduce the bug?

Setup a node instance,

» node

and run the following javascript code.

fs.promises.readFile("",{encoding:"base64",flag:1000000000000})

Then an abort occurs.

How often does it reproduce? Is there a required condition?

This abort can always be triggered following the steps above.

What is the expected behavior?

If any error occurs, an exception or other similar error-reporting stuff should be thrown. There is no reason to abort the whole node process.

What do you see instead?

» node
Welcome to Node.js v14.15.1.
Type ".help" for more information.
> fs.promises.readFile("",{encoding:"base64",flag:1000000000000})
node[250175]: ../src/node_file.cc:1746:void node::fs::OpenFileHandle(const v8::FunctionCallbackInfo<v8::Value>&): Assertion `args[1]->IsInt32()' failed.
 1: 0xa03530 node::Abort() [node]
 2: 0xa035ae  [node]
 3: 0xa0a27a  [node]
 4: 0xbe369b  [node]
 5: 0xbe4c46  [node]
 6: 0xbe52c6 v8::internal::Builtin_HandleApiCall(int, unsigned long*, v8::internal::Isolate*) [node]
 7: 0x13ff259  [node]
[1]    250175 abort (core dumped)  node

Additional information

[aduh95]

Duplicate of #37430.
Fixed by #37480, fix will be released with Node.js v16.0.0.