patch 9.0.1145: invalid memory access with recursive substitute expression
Problem: Invalid memory access with recursive substitute expression.
Solution: Check the return value of vim_regsub().
diff --git a/src/testdir/test_substitute.vim b/src/testdir/test_substitute.vim
index 2513223..4268aab 100644
--- a/src/testdir/test_substitute.vim
+++ b/src/testdir/test_substitute.vim
@@ -1115,6 +1115,22 @@
bwipe!
endfunc
+func Test_recursive_expr_substitute()
+ " this was reading invalid memory
+ let lines =<< trim END
+ func Repl(g, n)
+ s
+ r%:s000
+ endfunc
+ next 0
+ let caught = 0
+ s/\%')/\=Repl(0, 0)
+ qall!
+ END
+ call writefile(lines, 'XexprSubst', 'D')
+ call RunVim([], [], '--clean -S XexprSubst')
+endfunc
+
" Test for the 2-letter and 3-letter :substitute commands
func Test_substitute_short_cmd()
new