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vim-patch:8.2.3487: illegal memory access if buffer name is very long

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Problem:    Illegal memory access if buffer name is very long.
Solution:   Make sure not to go over the end of the buffer.
826bfe4bbd

Adjust the test to use :noswapfile, as Nvim fails to create the swap file on Windows due to the file
name's length (E303).

We don't have this behaviour on Linux as we get "[Permission denied]" from readfile(), so there is
no attempt to create the swap file. However, Vim doesn't try to create the swap file on Windows
either for a different reason: MAXPATHL in Vim for Windows is only 1024 (compared to Nvim's 4096 on
the Windows CI), so readfile() gives "Illegal file name" instead, thus not needing :noswapfile for
both cases.
This commit is contained in:
Sean Dewar 2021-10-08 20:44:58 +01:00 committed by zeertzjq
parent fc954d0a61
commit 76e6b81b23
2 changed files with 17 additions and 5 deletions
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10
src/nvim/screen.c
View File

@ -5173,19 +5173,19 @@ static void win_redr_status(win_T *wp)
*(p + len++) = ' ';
}
if (bt_help(wp->w_buffer)) {
STRCPY(p + len, _("[Help]"));
snprintf((char *)p + len, MAXPATHL - len, "%s", _("[Help]"));
len += (int)STRLEN(p + len);
}
if (wp->w_p_pvw) {
STRCPY(p + len, _("[Preview]"));
snprintf((char *)p + len, MAXPATHL - len, "%s", _("[Preview]"));
len += (int)STRLEN(p + len);
}
if (bufIsChanged(wp->w_buffer)) {
STRCPY(p + len, "[+]");
len += 3;
snprintf((char *)p + len, MAXPATHL - len, "%s", "[+]");
len += (int)STRLEN(p + len);
}
if (wp->w_buffer->b_p_ro) {
STRCPY(p + len, _("[RO]"));
snprintf((char *)p + len, MAXPATHL - len, "%s", _("[RO]"));
// len += (int)STRLEN(p + len); // dead assignment
}

12
src/nvim/testdir/test_statusline.vim
View File

@ -523,4 +523,16 @@ func Test_statusline_mbyte_fillchar()
%bw!
endfunc
" Used to write beyond allocated memory. This assumes MAXPATHL is 4096 bytes.
func Test_statusline_verylong_filename()
let fname = repeat('x', 4090)
" Nvim's swap file creation fails on Windows (E303) due to fname's length
" exe "new " .. fname
exe "noswapfile new " .. fname
set buftype=help
set previewwindow
redraw
bwipe!
endfunc
" vim: shiftwidth=2 sts=2 expandtab