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vim-patch:9.1.1609: complete: Heap-buffer overflow with complete function

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Problem:  complete: Heap-buffer overflow with complete function
          (zeertzjq)
Solution: Do not let startcol become negative (Girish Palya).

fixes: vim/vim#17907
closes: vim/vim#17934

761ea77670

Co-authored-by: Girish Palya <girishji@gmail.com>
Co-authored-by: Hirohito Higashi <h.east.727@gmail.com>
This commit is contained in:
zeertzjq
2025-08-09 10:43:49 +08:00
parent b1e35cbd7b
commit 5f23aaba00
2 changed files with 33 additions and 4 deletions
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28
test/old/testdir/test_ins_complete.vim
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@@ -5524,4 +5524,32 @@ func Test_scriplocal_autoload_func()
let &rtp = save_rtp
endfunc
" Issue #17907
func Test_omni_start_invalid_col()
func OmniFunc(startcol, findstart, base)
if a:findstart
return a:startcol
else
return ['foo', 'foobar']
endif
endfunc
new
redraw " need this to prevent NULL dereference in Nvim
set complete=o
set omnifunc=funcref('OmniFunc',\ [-1])
call setline(1, ['baz '])
call feedkeys("A\<C-N>\<Esc>0", 'tx!')
call assert_equal('baz foo', getline(1))
set omnifunc=funcref('OmniFunc',\ [1000])
call setline(1, ['bar '])
call feedkeys("A\<C-N>\<Esc>0", 'tx!')
call assert_equal('bar foo', getline(1))
bw!
delfunc OmniFunc
set omnifunc& complete&
endfunc
" vim: shiftwidth=2 sts=2 expandtab nofoldenable