neovim

commit f4a33929d9cd890e993771937935febe6bb88c92
parent 7ce17cd2a2657f0dd58213dc45d0309b18913a6f
Author: Jan Edmund Lazo <jan.lazo@mail.utoronto.ca>
Date:   Sun, 14 Dec 2025 10:41:40 -0500

vim-patch:8.2.5161: might still access invalid memory

Problem:    Might still access invalid memory.
Solution:   Add extra check for negative value.

https://github.com/vim/vim/commit/0fbc9260a75dfc4d86f20e7c0eb76878f513a212

Co-authored-by: Bram Moolenaar <Bram@vim.org>

Diffstat:
M
src/nvim/message.c
 | 
5
++++-

1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/src/nvim/message.c b/src/nvim/message.c
@@ -1052,8 +1052,11 @@ char *msg_may_trunc(bool force, char *s)
     return s;
   }
 
+  // If something unexpected happened "room" may be negative, check for that
+  // just in case.
   int room = (Rows - cmdline_row - 1) * Columns + sc_col - 1;
-  if ((force || (shortmess(SHM_TRUNC) && !exmode_active))
+  if (room > 0
+      && (force || (shortmess(SHM_TRUNC) && !exmode_active))
       && (int)strlen(s) - room > 0) {
     int size = vim_strsize(s);