https://bugzilla.novell.com/show_bug.cgi?id=378191
Summary: Rapidly calling DoDragDrop can cause
NullReferenceException
Product: Mono: Class Libraries
Version: 1.9.0
Platform: x86-64
OS/Version: RHEL 5
Status: NEW
Severity: Normal
Priority: P5 - None
Component: Windows.Forms
AssignedTo: [email protected]
ReportedBy: [EMAIL PROTECTED]
QAContact: [email protected]
Found By: ---
If the user of an application causes it to rapidly call DoDragDrop, then the
application may terminate with a NullReferenceException.
To reproduce:
1. Build and run the attached test case.
2. Rapidly click a mouse button (triple-click often triggers the problem for
me)
Example output (RHEL 5 x86-64, Mono 1.9 built from source):
Unhandled Exception: System.NullReferenceException: Object reference not set to
an instance of an object
at System.Windows.Forms.DataObject.SetData (System.Object data) [0x00000]
at System.Windows.Forms.X11Dnd.SetDataWithFormats (System.Object value)
[0x00000]
at System.Windows.Forms.X11Dnd.ConvertData (System.Windows.Forms.XEvent&
xevent) [0x00000]
at System.Windows.Forms.X11Dnd.Accepting_HandleEnterEvent
(System.Windows.Forms.XEvent& xevent) [0x00000]
at System.Windows.Forms.X11Dnd.HandleClientMessage
(System.Windows.Forms.XEvent& xevent) [0x00000]
at System.Windows.Forms.XplatUIX11.GetMessage (System.Object queue_id,
System.Windows.Forms.MSG& msg, IntPtr handle, Int32 wFilterMin, Int32
wFilterMax) [0x00000]
at System.Windows.Forms.XplatUI.GetMessage (System.Object queue_id,
System.Windows.Forms.MSG& msg, IntPtr hWnd, Int32 wFilterMin, Int32 wFilterMax)
[0x00000]
at System.Windows.Forms.Application.RunLoop (Boolean Modal,
System.Windows.Forms.ApplicationContext context) [0x00000]
at System.Windows.Forms.Application.Run
(System.Windows.Forms.ApplicationContext context) [0x00000]
at System.Windows.Forms.Application.Run (System.Windows.Forms.Form mainForm)
[0x00000]
at DragDropTest.Main () [0x00000]
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