commit https://github.com/vim/vim/commit/d3c907b5d2b352482b580a0cf687cbbea4c19ea1 Author: Bram Moolenaar <Bram@vim.org> Date: Wed Aug 17 21:32:09 2016 +0200 patch 7.4.2223 Problem: Buffer overflow when using latin1 character with feedkeys(). Solution: Check for an illegal character. Add a test.

--- a/src/os_unix.c
+++ b/src/os_unix.c
@@ -4806,7 +4806,7 @@ mch_call_shell(
 			     * round. */
 			    for (p = buffer; p < buffer + len; p += l)
 			    {
-				l = mb_cptr2len(p);
+				l = MB_CPTR2LEN(p);
 				if (l == 0)
 				    l = 1;  /* NUL byte? */
 				else if (MB_BYTE2LEN(*p) != l)