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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
This commit is contained in:
Sean Dewar
2025-05-04 03:15:51 +01:00
committed by GitHub
parent 2c1f5a6aa5
commit 627c648252
7 changed files with 56 additions and 16 deletions
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2
src/nvim/buffer_defs.h
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@@ -368,7 +368,7 @@ struct file_buffer {
int b_locked; // Buffer is being closed or referenced, don't
// let autocommands wipe it out.
int b_locked_split; // Buffer is being closed, don't allow opening
// a new window with it.
// it in more windows.
int b_ro_locked; // Non-zero when the buffer can't be changed.
// Used for FileChangedRO