vim-patch:8.0.0575: using freed memory when resetting 'indentexpr'

Problem:    Using freed memory when resetting 'indentexpr' while evaluating
            it. (Dominique Pelle)
Solution:   Make a copy of 'indentexpr'.
https://github.com/vim/vim/commit/a701b3b6f0f06ac0c9fcc75c6c34a1258fc3b1a2

1 files changed, 8 insertions, 1 deletions

diff --git a/src/nvim/indent.c b/src/nvim/indent.c
index efca739c2d..0d5b82bc5b 100644
--- a/src/nvim/indent.c
+++ b/src/nvim/indent.c
@@ -538,7 +538,14 @@ int get_expr_indent(void)
     sandbox++;
   }
   textlock++;
-  indent = (int)eval_to_number(curbuf->b_p_inde);
+
+  // Need to make a copy, the 'indentexpr' option could be changed while
+  // evaluating it.
+  char_u *inde_copy = vim_strsave(curbuf->b_p_inde);
+  if (inde_copy != NULL) {
+    indent = (int)eval_to_number(inde_copy);
+    xfree(inde_copy);
+  }
 
   if (use_sandbox) {
     sandbox--;