#9 when clicking on 'system'

[goldencut]

regular.user@ubuntu10.10_X86:~$ sysinfo
Exception in Gtk# callback delegate
Note: Applications can use GLib.ExceptionManager.UnhandledException to handle the exception.
System.NullReferenceException: Object reference not set to an instance of an object
at Sysinfo.SystemInfo.Xorg () [0x00000] in <filename unknown>:0
at Sysinfo.Sysinfo.on_notebook1_switch_page (System.Object o, Gtk.SwitchPageArgs e) [0x00000] in <filename unknown>:0
at Gtk.Notebook.SwitchPageSignalCallback (IntPtr arg0, IntPtr arg1, UInt32 arg2, IntPtr gch) [0x00000] in <filename unknown>:0
at GLib.ExceptionManager.RaiseUnhandledException(System.Exception e, Boolean is_terminal)
at Gtk.Notebook.SwitchPageSignalCallback(IntPtr arg0, IntPtr arg1, UInt32 arg2, IntPtr gch)
at Gtk.Notebook.gtk_notebook_set_current_page(IntPtr , Int32 )
at Gtk.Notebook.set_CurrentPage(Int32 value)
at Sysinfo.Sysinfo.on_treeview1_cursor_changed(System.Object o, System.EventArgs e)
at System.Reflection.MonoMethod.InternalInvoke(System.Object , System.Object[] , System.Exception ByRef )
at System.Reflection.MonoMethod.Invoke(System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture)
at System.Reflection.MethodBase.Invoke(System.Object obj, System.Object[] parameters)
at System.Delegate.DynamicInvokeImpl(System.Object[] args)
at System.MulticastDelegate.DynamicInvokeImpl(System.Object[] args)
at System.Delegate.DynamicInvoke(System.Object[] args)
at GLib.Signal.ClosureInvokedCB(System.Object o, GLib.ClosureInvokedArgs args)
at GLib.SignalClosure.Invoke(GLib.ClosureInvokedArgs args)
at GLib.SignalClosure.MarshalCallback(IntPtr raw_closure, IntPtr return_val, UInt32 n_param_vals, IntPtr param_values, IntPtr invocation_hint, IntPtr marshal_data)
at Gtk.Application.gtk_main()
at Gtk.Application.Run()
at Sysinfo.Sysinfo..ctor(System.String[] args)
at Sysinfo.Sysinfo.Main(System.String[] args)
suva@elukas:~$ sysinfo
Exception in Gtk# callback delegate
Note: Applications can use GLib.ExceptionManager.UnhandledException to handle the exception.
System.NullReferenceException: Object reference not set to an instance of an object
at Sysinfo.SystemInfo.Xorg () [0x00000] in <filename unknown>:0
at Sysinfo.Sysinfo.on_notebook1_switch_page (System.Object o, Gtk.SwitchPageArgs e) [0x00000] in <filename unknown>:0
at Gtk.Notebook.SwitchPageSignalCallback (IntPtr arg0, IntPtr arg1, UInt32 arg2, IntPtr gch) [0x00000] in <filename unknown>:0
at GLib.ExceptionManager.RaiseUnhandledException(System.Exception e, Boolean is_terminal)
at Gtk.Notebook.SwitchPageSignalCallback(IntPtr arg0, IntPtr arg1, UInt32 arg2, IntPtr gch)
at Gtk.Notebook.gtk_notebook_set_current_page(IntPtr , Int32 )
at Gtk.Notebook.set_CurrentPage(Int32 value)
at Sysinfo.Sysinfo.on_treeview1_cursor_changed(System.Object o, System.EventArgs e)
at System.Reflection.MonoMethod.InternalInvoke(System.Object , System.Object[] , System.Exception ByRef )
at System.Reflection.MonoMethod.Invoke(System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture)
at System.Reflection.MethodBase.Invoke(System.Object obj, System.Object[] parameters)
at System.Delegate.DynamicInvokeImpl(System.Object[] args)
at System.MulticastDelegate.DynamicInvokeImpl(System.Object[] args)
at System.Delegate.DynamicInvoke(System.Object[] args)
at GLib.Signal.ClosureInvokedCB(System.Object o, GLib.ClosureInvokedArgs args)
at GLib.SignalClosure.Invoke(GLib.ClosureInvokedArgs args)
at GLib.SignalClosure.MarshalCallback(IntPtr raw_closure, IntPtr return_val, UInt32 n_param_vals, IntPtr param_values, IntPtr invocation_hint, IntPtr marshal_data)
at Gtk.Application.gtk_main()
at Gtk.Application.Run()
at Sysinfo.Sysinfo..ctor(System.String[] args)
at Sysinfo.Sysinfo.Main(System.String[] args)

[Andreas Moog]

This patch (found in the Debian bugtracker) seems to fix this specific issue:

Description: Fix crash when gathering system information on newer Gnome
 versions.
 There is no <date> tag in recent versions of the gnome-version.xml so the variable
 gnomeB is never set to true which causes the loop to run until the end of the file
 is reached and there is no check if textread.ReadLine() returns null before any
 string operations are performed on the result.
Author: Alexander Grothe <alexander.grothe@googlemail.com>
Origin: other, https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=816481;msg=10
Bug-Debian: https://bugs.debian.org/816481
Bug-Ubuntu: https://launchpad.net/bugs/1575182
Forwarded: No, project seems dead upstream
Last-Update: 2017-05-24

--- sysinfo-0.7.orig/Sysinfo/SystemInfo.cs
+++ sysinfo-0.7/Sysinfo/SystemInfo.cs
@@ -171,9 +171,7 @@ namespace Sysinfo {

                                using (TextReader textread = File.OpenText(gnome_about)) {

-                                       while ( gnomeB == false ) {
-
-                                               temp = textread.ReadLine();
+                                       while ( (temp = textread.ReadLine()) != null && gnomeB == false ) {

                                                //get version from xml
                                                if ( temp.EndsWith("platform>")) {