gtkterm segfaults on send hexadecimal data

Binary package hint: gtkterm

apt-get install gtkterm

edb@lapedb:~$ dpkg -s gtkterm
Package: gtkterm
Status: install ok installed
Priority: optional
Section: comm
Installed-Size: 228
Maintainer: Sebastien Bacher <email address hidden>
Architecture: i386
Version: 0.99.5-1

Launch it menu -> "View" -> "Send hexadecimal data". A new input box appears, click in it and press "enter" without entering data. It segfault ;-)

Program received signal SIGSEGV, Segmentation fault.
0x080545f4 in ?? ()
(gdb) bt
#0 0x080545f4 in ?? ()
#1 0x00000000 in ?? ()

When I apt-get source it and compile it:
Program received signal SIGSEGV, Segmentation fault.
Send_Hexadecimal (widget=0x80a04a8, event=0x0, pointer=0xb77085d1)
    at widgets.c:613
613 all_written[0] = 0;
(gdb) bt
#0 Send_Hexadecimal (widget=0x80a04a8, event=0x0, pointer=0xb77085d1)
    at widgets.c:613
#1 0xb7a2c423 in g_cclosure_marshal_VOID__VOID ()
   from /usr/lib/libgobject-2.0.so.0
#2 0xb7a2079f in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#3 0xb7a2f2ea in g_signal_stop_emission () from /usr/lib/libgobject-2.0.so.0
#4 0xb7a30268 in g_signal_emitv () from /usr/lib/libgobject-2.0.so.0
#5 0xb7d4414c in gtk_bin_get_child () from /usr/lib/libgtk-x11-2.0.so.0
#6 0xb7d45047 in gtk_binding_set_by_class () from /usr/lib/libgtk-x11-2.0.so.0
#7 0xb7d452b7 in gtk_binding_set_by_class () from /usr/lib/libgtk-x11-2.0.so.0
#8 0xb7d454a7 in gtk_bindings_activate_event ()
   from /usr/lib/libgtk-x11-2.0.so.0
#9 0xb7eebc11 in gtk_widget_activate () from /usr/lib/libgtk-x11-2.0.so.0
#10 0xb7d9f495 in gtk_entry_set_visibility () from /usr/lib/libgtk-x11-2.0.so.0
#11 0xb7e098e0 in _gtk_marshal_BOOLEAN__BOXED ()
   from /usr/lib/libgtk-x11-2.0.so.0
#12 0xb7a2016f in g_cclosure_new_swap () from /usr/lib/libgobject-2.0.so.0
#13 0xb7a2079f in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#14 0xb7a2f9ce in g_signal_stop_emission () from /usr/lib/libgobject-2.0.so.0
#15 0xb7a30886 in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
#16 0xb7a30e89 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#17 0xb7eebdcf in gtk_widget_activate () from /usr/lib/libgtk-x11-2.0.so.0
#18 0xb7efb46d in gtk_window_propagate_key_event ()
#19 0xb7eff731 in gtk_window_activate_key () from /usr/lib/libgtk-x11-2.0.so.0
#20 0xb7e098e0 in _gtk_marshal_BOOLEAN__BOXED ()
   from /usr/lib/libgtk-x11-2.0.so.0
#21 0xb7a2016f in g_cclosure_new_swap () from /usr/lib/libgobject-2.0.so.0
#22 0xb7a2079f in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#23 0xb7a2f9ce in g_signal_stop_emission () from /usr/lib/libgobject-2.0.so.0
#24 0xb7a30886 in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
#25 0xb7a30e89 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#26 0xb7eebdcf in gtk_widget_activate () from /usr/lib/libgtk-x11-2.0.so.0
#27 0xb7e08169 in gtk_propagate_event () from /usr/lib/libgtk-x11-2.0.so.0
#28 0xb7e0846b in gtk_main_do_event () from /usr/lib/libgtk-x11-2.0.so.0
#29 0xb7cabdec in _gdk_events_queue () from /usr/lib/libgdk-x11-2.0.so.0
#30 0xb79af8d6 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#31 0xb79b2996 in g_main_context_check () from /usr/lib/libglib-2.0.so.0
#32 0xb79b2cb8 in g_main_loop_run () from /usr/lib/libglib-2.0.so.0
#33 0xb7e07765 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0
#34 0x08052a77 in main (argc=1, argv=0xbfae46f4) at gtkterm.c:68

Which is the following line:

  all_written = g_malloc(strlen(text) * 2);
  all_written[0] = 0;

Since I entered no text strlen(text)*2 equals zero. When you insert:

  if(strlen(text) ==0){
      message = g_strdup_printf(_("0 byte(s) sent !"));
      Put_temp_message(message, 1500);
      gtk_entry_set_text(GTK_ENTRY(widget), "");
      g_free(message);
      return FALSE;
  }

before the malloc (line 612) this fixes the issue.