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Unpacking.UnpackObject hangs permanently #309

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Metalnem opened this Issue Dec 27, 2018 · 0 comments

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Metalnem commented Dec 27, 2018

Unpacking.UnpackObject method sometimes hangs permanently. Here is the full C# program that reproduces such behavior:

using System.IO;

namespace MsgPack.Run
{
  public class Program
  {
    public static void Main(string[] args)
    {
      var bytes = new byte[]
      {
        0x8E, 0x80, 0xFF, 0x74, 0x6F, 0x0E, 0x41, 0xDF, 0x74,
        0x6F, 0x0E, 0x41, 0x90, 0x00, 0x00, 0x0F, 0x7B, 0x20,
        0x8E, 0x80, 0xFF, 0x74, 0x6F, 0x0E, 0x41, 0xDF, 0x74,
        0x6F, 0x0E, 0x41, 0x90, 0x00, 0x00, 0xF8, 0x7A, 0x20,
        0x70, 0x68, 0x00, 0xDF, 0x6F, 0x90, 0x1C, 0x6F, 0x74,
        0x6F, 0x61, 0x70, 0x68, 0x00, 0xDF, 0x52, 0x90, 0x1C,
        0x6F, 0x74, 0x6F, 0x61, 0x6D, 0x01, 0x02, 0x03, 0x04
      };

      using (var stream = new MemoryStream(bytes))
      {
        Unpacking.UnpackObject(stream);
      }
    }
  }
}

Found via SharpFuzz.

@Metalnem Metalnem closed this Jan 12, 2019

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