ASP.NET Core 2.2 memory leak

Hello all, I found memory leak when I sent files to API using IFormFile interface. With version 2.1 everything is ok.

Simple example: Content-type: multipart/form-data

controller

[ApiController]
public class FormController : ControllerBase
{
    [HttpPost]
    [Route("[controller]/Insert")]
    public async Task<IActionResult> Insert([FromForm] Form form)
    {
        return Ok();
    }
}

viewmodel

public class Form
{
    public string Name { get; set; }
    public IFormFile File { get; set; }
    public ICollection<DynamicInput> Inputs { get;set; }
}

public class DynamicInput
{
    public string Name { get; set; }
    public IFormFile File { get; set; }
}

process dotnet.exe

[travisjs]

@davidfowl

This seams to be caused by the following method being called when an array of IFormFiles has to be parsed by the ModelBinder. It does a loop with an upper range of int.MaxValue

https://github.com/aspnet/AspNetCore/blob/1aa50faa290ecda304507981cd01ed92651d5e34/src/Mvc/src/Microsoft.AspNetCore.Mvc.Core/ModelBinding/Binders/CollectionModelBinder.cs#L310-L324

[kameleon71]

Here you are: https://github.com/kameleon71/asp.net.core.2.2.memory.leak This example is based on template asp.net.core web app in VS2017 (angular client) Just run, click fetch data and watch memory usage 😉