Re: use-after-free in rl_display_match_list

[Grisha Levit]

On Mon, Mar 20, 2023 at 12:55 PM Grisha Levit <grishalevit@gmail.com> wrote:
>
> A SIGINT received during get_y_or_n in display_matches can leave
> rl_display_match_list working with an already-freed matches array.

Actually, the same thing can happen during calls to _rl_internal_pager
within rl_display_match_list.

So maybe also:

----

diff --git a/lib/readline/complete.c b/lib/readline/complete.c
index d6dd7dca..c7dcb82d 100644
--- a/lib/readline/complete.c
+++ b/lib/readline/complete.c
@@ -1630,7 +1630,7 @@ rl_display_match_list (char **matches, int len, int max)
    if (_rl_page_completions && lines >= (_rl_screenheight - 1) && i < count)
      {
        lines = _rl_internal_pager (lines);
-       if (lines < 0)
+       if (lines < 0 || _rl_complete_display_matches_interrupt)
  return;
      }
  }
@@ -1658,7 +1658,7 @@ rl_display_match_list (char **matches, int len, int max)
    if (_rl_page_completions && lines >= _rl_screenheight - 1)
      {
        lines = _rl_internal_pager (lines);
-       if (lines < 0)
+       if (lines < 0 || _rl_complete_display_matches_interrupt)
  return;
      }
  }