`Fatal error. Internal CLR error` when working with image created by pointer-based overload of `Image.WrapMemory<TPixel>`

[KirillAldashkin]

Prerequisites

• I have written a descriptive issue title
• I have verified that I am running the latest version of ImageSharp
• I have verified if the problem exist in both DEBUG and RELEASE mode
• I have searched open and closed issues to ensure it has not already been reported

ImageSharp version

3.1.5

Other ImageSharp packages and versions

none

Environment (Operating system, version and so on)

Windows 11 23H2 22631.3880

.NET Framework version

.NET SDK 8.0

Description

This happens when using WrapMemory<TPixel>(void* pointer, int bufferSizeInBytes, int width, int height) and passing buffer that is too small for given width, height and TPixel even with correct bufferSizeInBytes value

Expected behaviour

Exception saying that given buffer is too small for given image size and pixel format

Actual behaviour

Fatal error. Internal CLR error

Steps to Reproduce

Run this code

using SixLabors.ImageSharp;
using SixLabors.ImageSharp.PixelFormats;
using System.Runtime.InteropServices;

unsafe
{
    // these two lines are correct: no overflow ("checked") and no overrun ("bufferSize" is used)
    int bufferSize = checked(8192 * 8192);
    void* data = NativeMemory.Alloc(checked((nuint)bufferSize));
    // passing correct buffer size
    using Image<Rgba64> img = Image.WrapMemory<Rgba64>(data, bufferSize, 8192, 8192);
    // oops!
    img.SaveAsPng("output.png");
    // already crashed at this point
    NativeMemory.Free(data);
}

Images

No response

[KirillAldashkin]

Already found the reason:

ImageSharp/src/ImageSharp/Image.WrapMemory.cs

Line 428 in 65ae451

Guard.MustBeGreaterThanOrEqualTo(bufferSizeInBytes, memoryManager.Memory.Span.Length, nameof(bufferSizeInBytes));

bufferSizeInBytes (in bytes) is compared with memoryManager.Memory.Span.Length (in pixels).
X bytes is smaller than X multibyte pixels so it overruns passed buffer