From 1ac588543ded834b254c7f6a73372583ce89f2ea Mon Sep 17 00:00:00 2001
From: zeertzjq <zeertzjq@outlook.com>
Date: Sat, 7 Oct 2023 06:32:06 +0800
Subject: vim-patch:9.0.1995: Invalid memory access with empty 'foldexpr'
 (#25530)

Problem:  Invalid memory access when 'foldexpr' returns empty string.
Solution: Check for NUL.

closes: vim/vim#13293

https://github.com/vim/vim/commit/a991ce9c083bb8c02b1b1ec34ed35728197050f3
---
 src/nvim/eval.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/nvim/eval.c b/src/nvim/eval.c
index 9a90e430a7..12226dac91 100644
--- a/src/nvim/eval.c
+++ b/src/nvim/eval.c
@@ -1299,7 +1299,7 @@ int eval_foldexpr(win_T *wp, int *cp)
       // If the result is a string, check if there is a non-digit before
       // the number.
       char *s = tv.vval.v_string;
-      if (!ascii_isdigit(*s) && *s != '-') {
+      if (*s != NUL && !ascii_isdigit(*s) && *s != '-') {
         *cp = (uint8_t)(*s++);
       }
       retval = atol(s);
-- 
cgit