# HG changeset patch
# User Bram Moolenaar <Bram@vim.org>
# Date 1676904303 -3600
# Node ID bb31c1c6d1adfd7e07756019d430231cf2a67525
# Parent  c7a3b0bfa44b33d9f4a1f0eb1245cec11cbfcaac
patch 9.0.1331: illegal memory access when using :ball in Visual mode

Commit: https://github.com/vim/vim/commit/e1121b139480f53d1b06f84f3e4574048108fa0b
Author: Pavel Mayorov <pmayorov@cloudlinux.com>
Date:   Mon Feb 20 14:35:20 2023 +0000

    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 https://github.com/vim/vim/issues/11923)

diff --git a/src/buffer.c b/src/buffer.c
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -5402,6 +5402,10 @@ ex_buffer_all(exarg_T *eap)
     else
 	all = TRUE;
 
+    // Stop Visual mode, the cursor and "VIsual" may very well be invalid after
+    // switching to another buffer.
+    reset_VIsual_and_resel();
+
     setpcmark();
 
 #ifdef FEAT_GUI
diff --git a/src/testdir/test_visual.vim b/src/testdir/test_visual.vim
--- a/src/testdir/test_visual.vim
+++ b/src/testdir/test_visual.vim
@@ -1534,4 +1534,25 @@ func Test_switch_buffer_ends_visual_mode
   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
diff --git a/src/version.c b/src/version.c
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@ static char *(features[]) =
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1331,
+/**/
     1330,
 /**/
     1329,