4.3-rc2: fix crash in rl_do_undo

[Andreas Schwab]

Type M-. (insert-last-argument) twice -> crash.

Andreas.

diff --git a/lib/readline/undo.c b/lib/readline/undo.c
index a3d4044..f30ccf3 100644
--- a/lib/readline/undo.c
+++ b/lib/readline/undo.c
@@ -237,7 +237,7 @@ rl_do_undo ()
       /* If we are editing a history entry, make sure the change is replicated
         in the history entry's line */
       cur = current_history ();
-      if ((UNDO_LIST *)cur->data == release)
+      if (cur != NULL && (UNDO_LIST *)cur->data == release)
        {
          temp = replace_history_entry (where_history (), rl_line_buffer, 
(histdata_t)rl_undo_list);
          xfree (temp->line);
-- 
Andreas Schwab, schwab@linux-m68k.org
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