commit a701b3b6f0f06ac0c9fcc75c6c34a1258fc3b1a2
author Bram Moolenaar <Bram@vim.org> Thu Apr 20 22:57:27 2017 +0200
committer Bram Moolenaar <Bram@vim.org> Thu Apr 20 22:57:27 2017 +0200
tree 23d623833093529287f373c9428ebad70ddb6835
parent 99895eac1cf71be43ece7e14b50e206e041fbe9f

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'.

src/testdir/test_options.vim

diff --git a/src/testdir/test_options.vim b/src/testdir/test_options.vim
index d72ca74..5d2033a 100644
--- a/src/testdir/test_options.vim
+++ b/src/testdir/test_options.vim
@@ -319,3 +319,16 @@
     throw 'Skipped: opt_test.vim does not exist'
   endif
 endfunc
+
+func ResetIndentexpr()
+  set indentexpr=
+endfunc
+
+func Test_set_indentexpr()
+  " this was causing usage of freed memory
+  set indentexpr=ResetIndentexpr()
+  new
+  call feedkeys("i\<c-f>", 'x')
+  call assert_equal('', &indentexpr)
+  bwipe!
+endfunc