Uploading file bigger than the size limit lead to rocketchat server to stop/crash

Description:

One of our user (admin rights) upload a big file (2GB) when the limit is set to:

at the end of the transfer, (100% uploaded) the server became unresponsive

Steps to reproduce:

1. set a upload size limit
2. upload a bigger file than the limit
3. server crash

Expected behavior:

Message saying that the file is higher than the limit and not start the upload (or stop it when the limit is reached)

Actual behavior:

The rocketchat server went unresponsive, as well as the hosting server (ubuntu).

Server Setup Information:

• Version of Rocket.Chat Server: 3.18.1
• Operating System: Ubuntu 18.04.6 LTS
• Deployment Method: snap
• Number of Running Instances: 1
• DB Replicaset Oplog: 1
• NodeJS Version: 12.22.1 - x64
• MongoDB Version: 3.6.14

Client Setup Information

• Desktop App or Browser Version: Desktop 3.5.6
• Operating System: Windows 10

Additional context

Relevant logs:

Exception in callback of async function: RangeError [ERR_INVALID_OPT_VALUE] [ERR_INVALID_OPT_VALUE]: The value "2482641664" is invalid for option "size"
     at Function.allocUnsafe (buffer.js:383:3)
     at Function.concat (buffer.js:564:25)
     at FileStream.<anonymous> (app/api/server/lib/getUploadFormData.js:18:81)
     at FileStream.emit (events.js:326:22)
     at FileStream.EventEmitter.emit (domain.js:483:12)
     at endReadableNT (_stream_readable.js:1241:12)
     at processTicksAndRejections (internal/process/task_queues.js:84:21) {
   code: 'ERR_INVALID_OPT_VALUE'
 }

Start with app/api/server/lib/getUploadFormData.js at the line 18 stack-trace entry, then reproduce the upload using a configured size limit and an oversized file. Done means the server remains responsive and the client receives a message that the file exceeds the limit without completing the upload.