From d0b5c1f696016a90a5b386339f4425a7bc69f252 Mon Sep 17 00:00:00 2001
From: zeertzjq <zeertzjq@outlook.com>
Date: Fri, 11 Mar 2022 22:59:26 +0800
Subject: vim-patch:8.2.4440: crash with specific regexp pattern and string

Problem:    Crash with specific regexp pattern and string.
Solution:   Stop at the start of the string.
https://github.com/vim/vim/commit/6456fae9ba8e72c74b2c0c499eaf09974604ff30
---
 src/nvim/regexp_bt.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'src/nvim/regexp_bt.c')

diff --git a/src/nvim/regexp_bt.c b/src/nvim/regexp_bt.c
index f6804e8415..1153b8ed33 100644
--- a/src/nvim/regexp_bt.c
+++ b/src/nvim/regexp_bt.c
@@ -4083,6 +4083,10 @@ static bool regmatch(
                 break;
               if (rex.input == rex.line) {
                 // backup to last char of previous line
+                if (rex.lnum == 0) {
+                  status = RA_NOMATCH;
+                  break;
+                }
                 rex.lnum--;
                 rex.line = reg_getline(rex.lnum);
                 // Just in case regrepeat() didn't count right.
-- 
cgit