Hi Christian,

On Sun, Sep 3, 2023 at 11:30 AM Christian Brabandt <cbli...@256bit.org> wrote:
>
> patch 9.0.1857: [security] heap-use-after-free in is_qf_win()
>
> Commit: 
> https://github.com/vim/vim/commit/fc68299d436cf87453e432daa77b6d545df4d7ed
> Author: Christian Brabandt <c...@256bit.org>
> Date:   Sun Sep 3 20:20:52 2023 +0200
>
>     patch 9.0.1857: [security] heap-use-after-free in is_qf_win()
>
>     Problem:  heap-use-after-free in is_qf_win()
>     Solution: Check buffer is valid before accessing it
>
>     Signed-off-by: Christian Brabandt <c...@256bit.org>
>
> diff --git a/src/testdir/crash/bt_quickfix_poc 
> b/src/testdir/crash/bt_quickfix_poc
> new file mode 100644
> index 000000000..bf02b4dcb
> --- /dev/null
> +++ b/src/testdir/crash/bt_quickfix_poc
> @@ -0,0 +1,9 @@
> +comman!-narg=* Xexpr <mods>lex<args>
> +auto BufReadPre * exe"sn" ..expand("<abuf>")
> +fu Xautocmd_changelist()
> +cal writefile(['Xtestfile2:4:4'],'Xerr')
> +  sil! edi Xerr
> +Xexpr 'Xtestfile:4:4'
> +endf
> +call Xautocmd_changelist()
> +call Xautocmd_changelist()
> \ No newline at end of file
>

Is there supposed to be a newline at the end of this file?

- Yegappan

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