neovim

commit d0b5c1f696016a90a5b386339f4425a7bc69f252
parent 76769b8a1f5b34f4b0cef389597cec2796ca91b7
Author: zeertzjq <zeertzjq@outlook.com>
Date:   Fri, 11 Mar 2022 22:59:26 +0800

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

Diffstat:
M
src/nvim/regexp_bt.c
 | 
4
++++
M
src/nvim/testdir/test_regexp_utf8.vim
 | 
12
++++++++++--

2 files changed, 14 insertions(+), 2 deletions(-)
diff --git 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.
diff --git a/src/nvim/testdir/test_regexp_utf8.vim b/src/nvim/testdir/test_regexp_utf8.vim
@@ -540,7 +540,6 @@ endfunc
 " Check that [[:upper:]] matches for automatic engine
 func Test_match_char_class_upper()
   new
-  let _engine=&regexpengine
 
   " Test 1: [[:upper:]]\{2,\}
   set regexpengine=0
@@ -581,7 +580,7 @@ func Test_match_char_class_upper()
   call assert_equal(4, searchcount().total, 'TEST 3 lower')
 
   " clean up
-  let &regexpengine=_engine
+  set regexpengine=0
   bwipe!
 endfunc
 
@@ -593,4 +592,13 @@ func Test_match_invalid_byte()
   call delete('Xinvalid')
 endfunc
 
+func Test_match_too_complicated()
+  set regexpengine=1
+  exe "vsplit \xeb\xdb\x99"
+  silent! buf \&\zs*\zs*0
+  bwipe!
+  set regexpengine=0
+endfunc
+
+
 " vim: shiftwidth=2 sts=2 expandtab