[Mono-bugs] [Bug 661750] New: Setting value of hexadecimal NumericUpDown control to 0 crashes Mono runtime

[bugzilla_noreply at novell.com]

https://bugzilla.novell.com/show_bug.cgi?id=661750

https://bugzilla.novell.com/show_bug.cgi?id=661750#c0


           Summary: Setting value of hexadecimal NumericUpDown control to
                    0 crashes Mono runtime
    Classification: Mono
           Product: Mono: Class Libraries
           Version: 2.8.x
          Platform: x86
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: Windows.Forms
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: oliver.thimm at web.de
         QAContact: mono-bugs at lists.ximian.com
          Found By: Corporate Interoperability Test
           Blocker: ---


Created an attachment (id=406526)
 --> (http://bugzilla.novell.com/attachment.cgi?id=406526)
Test application to demonstrate the bug.

Description of Problem:

If the value of a NumericUpDown control in hexadecimal mode is set to 0 the
application (runtime) stops working (without a stack trace).

Steps to reproduce the problem:
1. Compile and run the attached code.
2. Press the button (which sets the value to 0)
           - or -
   Write 0 into the text box and press enter
           - or -
   Press the decrementer


Actual Results:

   On Windows (Mono 2.8.x) and Ubuntu (Mono 2.6.x) the application stops
   working and has to be terminated.

Expected Results:

   0 is an allowed value for the control (verfied with .NET runtime).

How often does this happen?

   Always. 

Additional Information:

The bug only occurs if the control is in hexadecimal mode. The problem seems to
be located in NumericUpDown::UpdateEditText() as after the member 'Text' is
already set to "0" because num_chars is 0 the expression is further evaluated
which results in 'Text' is set to an empty string. This empty string is also
the side effect if the initial value of the control is 0.

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