patch 9.0.1331: illegal memory access when using :ball in Visual mode
Problem: Illegal memory access when using :ball in Visual mode.
Solution: Stop Visual mode when using :ball. (Pavel Mayorov, closes #11923)
diff --git a/src/testdir/test_visual.vim b/src/testdir/test_visual.vim
index 295e16f..f152e7b 100644
--- a/src/testdir/test_visual.vim
+++ b/src/testdir/test_visual.vim
@@ -1534,4 +1534,25 @@
exe 'bwipe!' buf2
endfunc
+" Check fix for the heap-based buffer overflow bug found in the function
+" utfc_ptr2len and reported at
+" https://huntr.dev/bounties/ae933869-a1ec-402a-bbea-d51764c6618e
+func Test_heap_buffer_overflow()
+ enew
+ set updatecount=0
+
+ norm R0
+ split other
+ norm R000
+ exe "norm \<C-V>l"
+ ball
+ call assert_equal(getpos("."), getpos("v"))
+ call assert_equal('n', mode())
+ norm zW
+
+ %bwipe!
+ set updatecount&
+endfunc
+
+
" vim: shiftwidth=2 sts=2 expandtab