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vim-patch:9.1.1361: [security]: possible use-after-free when closing a buffer (#33820)

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Problem:  [security]: Possible to open more windows into a closing
          buffer without splitting, bypassing existing "b_locked_split"
          checks and triggering use-after-free
Solution: Disallow switching to a closing buffer. Editing a closing
          buffer (via ":edit", etc.) was fixed in v9.1.0764, but add an
          error message and check just "b_locked_split", as "b_locked"
          is necessary only when the buffer shouldn't be wiped, and may
          be set for buffers that are in-use but not actually closing.
          (Sean Dewar)

closes: vim/vim#17246

6cb1c82840
(cherry picked from commit 627c648252)
This commit is contained in:
Sean Dewar
2025-05-04 03:15:51 +01:00
committed by github-actions[bot]
parent bdd8498ed7
commit 9965cfb84c
7 changed files with 56 additions and 16 deletions
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3
test/old/testdir/test_autocmd.vim
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@@ -4174,7 +4174,8 @@ func Test_autocmd_BufWinLeave_with_vsp()
exe "e " fname
vsp
augroup testing
exe "au BufWinLeave " .. fname .. " :e " dummy .. "| vsp " .. fname
exe 'au BufWinLeave' fname 'e' dummy
\ '| call assert_fails(''vsp' fname ''', ''E1546:'')'
augroup END
bw
call CleanUpTestAuGroup()