[gnome-builder] debugger: be more stringent in bounds checking

[Christian Hergert <chergert src gnome org>]

commit d3ae9fe602813b5b196c76fba9b4518fc1ac6084
Author: Christian Hergert <chergert redhat com>
Date:   Mon Jul 2 17:58:27 2018 -0700

    debugger: be more stringent in bounds checking

 src/libide/debugger/ide-debugger-editor-addin.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)
---
diff --git a/src/libide/debugger/ide-debugger-editor-addin.c b/src/libide/debugger/ide-debugger-editor-addin.c
index 3121b05f9..d8fd23c9b 100644
--- a/src/libide/debugger/ide-debugger-editor-addin.c
+++ b/src/libide/debugger/ide-debugger-editor-addin.c
@@ -107,8 +107,12 @@ debugger_log (IdeDebuggerEditorAddin *self,
       while (NULL != (line = ide_line_reader_next (&reader, &line_len)))
         {
           vte_terminal_feed (VTE_TERMINAL (self->log_view), line, line_len);
-          if (line[line_len] == '\r' || line[line_len] == '\n')
-            vte_terminal_feed (VTE_TERMINAL (self->log_view), "\r\n", 2);
+
+          if ((line + line_len) < (str + len))
+            {
+              if (line[line_len] == '\r' || line[line_len] == '\n')
+                vte_terminal_feed (VTE_TERMINAL (self->log_view), "\r\n", 2);
+            }
         }
     }
 }