1 files changed, 6 insertions, 0 deletions
diff --git a/gas/config/obj-coff.c b/gas/config/obj-coff.c
index f52732d..b06710a 100644
--- a/gas/config/obj-coff.c
+++ b/gas/config/obj-coff.c
@@ -434,6 +434,12 @@ add_lineno (frag, offset, num)
     {
       abort ();
     }
+  if (num <= 0) 
+    {
+      /* Zero is used as an end marker in the file.  */
+      as_bad (_("Line numbers must be positive integers\n"));
+      return;
+    }
   new_line->next = line_nos;
   new_line->frag = frag;
   new_line->l.line_number = num;