[Mono-bugs] [Bug 657207] New: 2.8.1 regression: System.Drawing.Graphics destructor doesnt check for null before disposing maccontext

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https://bugzilla.novell.com/show_bug.cgi?id=657207

https://bugzilla.novell.com/show_bug.cgi?id=657207#c0


           Summary: 2.8.1 regression: System.Drawing.Graphics destructor
                    doesnt check for null before disposing maccontext
    Classification: Mono
           Product: Mono: Class Libraries
           Version: 2.8.x
          Platform: Macintosh
        OS/Version: Mac OS X 10.6
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: Sys.Drawing.
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: brian at sooloos.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: Community User
           Blocker: ---


Description of Problem:

If I create a Graphics from a bitmap, Graphics.Dispose crashes when called.
This is new in 2.8.1--2.8 did not exhibit this problem.

Steps to reproduce the problem:

$ cat > t.cs
using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;

public class Foo {
    public static void Main(string[] args) {
        Bitmap bmp = new Bitmap(10, 10, PixelFormat.Format24bppRgb);
        using (Graphics g = Graphics.FromImage(bmp)) {
        }
    }
}
$ gmcs /r:System.Drawing t.cs
$ mono --debug t.exe
Unhandled Exception: System.NullReferenceException: Object reference not set to
an instance of an object
  at System.Drawing.Graphics.Dispose () [0x00025] in
/private/tmp/monobuild/build/BUILD/mono-2.8.1/mcs/class/System.Drawing/System.Drawing/Graphics.cs:300 
  at Foo.Main (System.String[] args) [0x00000] in <filename unknown>:0

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