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diff -up vim82/src/buffer.c.cve0443 vim82/src/buffer.c
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--- vim82/src/buffer.c.cve0443 2021-03-22 10:02:42.000000000 +0100
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+++ vim82/src/buffer.c 2022-02-10 08:33:19.159488384 +0100
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@@ -1710,6 +1710,7 @@ set_curbuf(buf_T *buf, int action)
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#endif
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bufref_T newbufref;
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bufref_T prevbufref;
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+ int valid;
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setpcmark();
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if ((cmdmod.cmod_flags & CMOD_KEEPALT) == 0)
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@@ -1763,13 +1764,19 @@ set_curbuf(buf_T *buf, int action)
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// An autocommand may have deleted "buf", already entered it (e.g., when
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// it did ":bunload") or aborted the script processing.
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// If curwin->w_buffer is null, enter_buffer() will make it valid again
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- if ((buf_valid(buf) && buf != curbuf
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+ valid = buf_valid(buf);
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+ if ((valid && buf != curbuf
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#ifdef FEAT_EVAL
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&& !aborting()
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#endif
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) || curwin->w_buffer == NULL)
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{
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- enter_buffer(buf);
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+ // If the buffer is not valid but curwin->w_buffer is NULL we must
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+ // enter some buffer. Using the last one is hopefully OK.
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+ if (!valid)
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+ enter_buffer(lastbuf);
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+ else
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+ enter_buffer(buf);
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#ifdef FEAT_SYN_HL
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if (old_tw != curbuf->b_p_tw)
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check_colorcolumn(curwin);
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@@ -2286,8 +2293,7 @@ free_buf_options(
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clear_string_option(&buf->b_p_vsts);
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vim_free(buf->b_p_vsts_nopaste);
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buf->b_p_vsts_nopaste = NULL;
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- vim_free(buf->b_p_vsts_array);
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- buf->b_p_vsts_array = NULL;
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+ VIM_CLEAR(buf->b_p_vsts_array);
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clear_string_option(&buf->b_p_vts);
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VIM_CLEAR(buf->b_p_vts_array);
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#endif
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diff -up vim82/src/testdir/test_quickfix.vim.cve0443 vim82/src/testdir/test_quickfix.vim
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--- vim82/src/testdir/test_quickfix.vim.cve0443 2021-03-22 10:02:42.000000000 +0100
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+++ vim82/src/testdir/test_quickfix.vim 2022-02-10 08:34:10.288204457 +0100
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@@ -923,6 +923,7 @@ func Test_locationlist_curwin_was_closed
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call assert_fails('lrewind', 'E924:')
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augroup! testgroup
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+ delfunc R
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endfunc
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func Test_locationlist_cross_tab_jump()
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@@ -5372,4 +5373,20 @@ func Test_vimgrep_noswapfile()
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set swapfile
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endfunc
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+" Weird sequence of commands that caused entering a wiped-out buffer
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+func Test_lopen_bwipe()
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+ func R()
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+ silent! tab lopen
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+ e x
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+ silent! lfile
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+ endfunc
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+
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+ cal R()
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+ cal R()
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+ cal R()
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+ bw!
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+ delfunc R
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+endfunc
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+
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+
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" vim: shiftwidth=2 sts=2 expandtab
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