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vim is using freed memory when pasting with the mouse #130

Closed GoogleCodeExporter closed 9 years ago

GoogleCodeExporter commented 9 years ago 
vim is using freed memory when pasting with the mouse in some circumstances.

What steps will reproduce the problem?

1. Create a vimrc-bug.txt file (which I tried to keep as small
   as possible) as follows:

$ cat > vimrc-bug.txt <<EOF
set nocompatible
set mouse=a
set laststatus=2

" Function used to display utf-8 sequence.
fun! ShowUtf8Sequence()
  try
    let p = getpos('.')
    redir => utfseq
    sil normal! g8
    redir End
    call setpos('.', p)
    return substitute(matchstr(utfseq, '\x\+ .*\x'), '\<\x', '0x&', 'g')
  catch
    return '?'
  endtry
endfunction

set statusline=%{ShowUtf8Sequence()}\         " utf-8 sequence
set statusline+=U+%04B\                       " Unicode char under cursor
EOF

2. Create a file bug.txt containing 2 lines with parenthesis as follows:

$ cat > bug.txt <<EOF
(
)
EOF

3. Run vim with valgrind:

$ valgrind --num-callers=50 --log-file=valgrind.log vim -u vimrc-bug.txt bug.txt

4. Press  A  in Vim to append at the end of the first line.

5. Copy some text with the mouse from another window,
   and press the middle button to paste inside Vim.

6. Observe in valgrind.log the following errors as soon as the 
   text is pasted with the mouse:

==3572== Memcheck, a memory error detector
==3572== Copyright (C) 2002-2012, and GNU GPL'd, by Julian Seward et al.
==3572== Using Valgrind-3.9.0.SVN and LibVEX; rerun with -h for copyright info
==3572== Command: /home/dope/sb/vim/src/vim -u /home/dope/vimrc-bug.txt bug.txt
==3572== Parent PID: 3134
==3572== 
==3572== Invalid read of size 1
==3572==    at 0x415F28: build_stl_str_hl (buffer.c:3959)
==3572==    by 0x55D2A4: win_redr_custom (screen.c:6595)
==3572==    by 0x55CC97: redraw_custom_statusline (screen.c:6382)
==3572==    by 0x55C73F: win_redr_status (screen.c:6244)
==3572==    by 0x55BC8D: redraw_statuslines (screen.c:5860)
==3572==    by 0x4325C3: ins_mouse (edit.c:9136)
==3572==    by 0x425948: edit (edit.c:1147)
==3572==    by 0x513E78: invoke_edit (normal.c:9224)
==3572==    by 0x513E11: nv_edit (normal.c:9197)
==3572==    by 0x505F1E: normal_cmd (normal.c:1199)
==3572==    by 0x4BCA4E: main_loop (main.c:1322)
==3572==    by 0x4BC397: main (main.c:1013)
==3572==  Address 0xdb031a0 is 0 bytes inside a block of size 25 free'd
==3572==    at 0x4C2B6F9: free (vg_replace_malloc.c:446)
==3572==    by 0x4F3FA5: vim_free (misc2.c:1744)
==3572==    by 0x4D1C54: ml_flush_line (memline.c:3481)
==3572==    by 0x4CF974: ml_get_buf (memline.c:2455)
==3572==    by 0x4E4740: plines_win_nofold (misc1.c:1947)
==3572==    by 0x4E46EB: plines_win_nofill (misc1.c:1928)
==3572==    by 0x4E4635: plines_win (misc1.c:1894)
==3572==    by 0x4F9DB1: comp_botline (move.c:95)
==3572==    by 0x4FA930: validate_botline (move.c:573)
==3572==    by 0x4FA1B9: update_topline (move.c:276)
==3572==    by 0x47DD86: update_topline_cursor (ex_docmd.c:9309)
==3572==    by 0x47E2EF: exec_normal_cmd (ex_docmd.c:9538)
==3572==    by 0x47E103: ex_normal (ex_docmd.c:9438)
==3572==    by 0x472AAD: do_one_cmd (ex_docmd.c:2684)
==3572==    by 0x470028: do_cmdline (ex_docmd.c:1122)
==3572==    by 0x4587CC: call_user_func (eval.c:22679)
==3572==    by 0x440437: call_func (eval.c:8506)
==3572==    by 0x43FFC2: get_func_tv (eval.c:8348)
==3572==    by 0x43B814: eval7 (eval.c:5164)
==3572==    by 0x43B0AD: eval6 (eval.c:4816)
==3572==    by 0x43AC1C: eval5 (eval.c:4632)
==3572==    by 0x43A01B: eval4 (eval.c:4325)
==3572==    by 0x439E68: eval3 (eval.c:4237)
==3572==    by 0x439CE7: eval2 (eval.c:4166)
==3572==    by 0x439B26: eval1 (eval.c:4091)
==3572==    by 0x439A85: eval0 (eval.c:4048)
==3572==    by 0x434AC6: eval_to_string (eval.c:1361)
==3572==    by 0x434C37: eval_to_string_safe (eval.c:1409)
==3572==    by 0x415B11: build_stl_str_hl (buffer.c:3859)
==3572==    by 0x55D2A4: win_redr_custom (screen.c:6595)
==3572==    by 0x55CC97: redraw_custom_statusline (screen.c:6382)
==3572==    by 0x55C73F: win_redr_status (screen.c:6244)
==3572==    by 0x55BC8D: redraw_statuslines (screen.c:5860)
==3572==    by 0x4325C3: ins_mouse (edit.c:9136)
==3572==    by 0x425948: edit (edit.c:1147)
==3572==    by 0x513E78: invoke_edit (normal.c:9224)
==3572==    by 0x513E11: nv_edit (normal.c:9197)
==3572==    by 0x505F1E: normal_cmd (normal.c:1199)
==3572==    by 0x4BCA4E: main_loop (main.c:1322)
==3572==    by 0x4BC397: main (main.c:1013)
==3572== 
==3572== Invalid read of size 1
==3572==    at 0x50001D: utf_ptr2char (mbyte.c:1697)
==3572==    by 0x415F63: build_stl_str_hl (buffer.c:3964)
==3572==    by 0x55D2A4: win_redr_custom (screen.c:6595)
==3572==    by 0x55CC97: redraw_custom_statusline (screen.c:6382)
==3572==    by 0x55C73F: win_redr_status (screen.c:6244)
==3572==    by 0x55BC8D: redraw_statuslines (screen.c:5860)
==3572==    by 0x4325C3: ins_mouse (edit.c:9136)
==3572==    by 0x425948: edit (edit.c:1147)
==3572==    by 0x513E78: invoke_edit (normal.c:9224)
==3572==    by 0x513E11: nv_edit (normal.c:9197)
==3572==    by 0x505F1E: normal_cmd (normal.c:1199)
==3572==    by 0x4BCA4E: main_loop (main.c:1322)
==3572==    by 0x4BC397: main (main.c:1013)
==3572==  Address 0xdb031b8 is 24 bytes inside a block of size 25 free'd
==3572==    at 0x4C2B6F9: free (vg_replace_malloc.c:446)
==3572==    by 0x4F3FA5: vim_free (misc2.c:1744)
==3572==    by 0x4D1C54: ml_flush_line (memline.c:3481)
==3572==    by 0x4CF974: ml_get_buf (memline.c:2455)
==3572==    by 0x4E4740: plines_win_nofold (misc1.c:1947)
==3572==    by 0x4E46EB: plines_win_nofill (misc1.c:1928)
==3572==    by 0x4E4635: plines_win (misc1.c:1894)
==3572==    by 0x4F9DB1: comp_botline (move.c:95)
==3572==    by 0x4FA930: validate_botline (move.c:573)
==3572==    by 0x4FA1B9: update_topline (move.c:276)
==3572==    by 0x47DD86: update_topline_cursor (ex_docmd.c:9309)
==3572==    by 0x47E2EF: exec_normal_cmd (ex_docmd.c:9538)
==3572==    by 0x47E103: ex_normal (ex_docmd.c:9438)
==3572==    by 0x472AAD: do_one_cmd (ex_docmd.c:2684)
==3572==    by 0x470028: do_cmdline (ex_docmd.c:1122)
==3572==    by 0x4587CC: call_user_func (eval.c:22679)
==3572==    by 0x440437: call_func (eval.c:8506)
==3572==    by 0x43FFC2: get_func_tv (eval.c:8348)
==3572==    by 0x43B814: eval7 (eval.c:5164)
==3572==    by 0x43B0AD: eval6 (eval.c:4816)
==3572==    by 0x43AC1C: eval5 (eval.c:4632)
==3572==    by 0x43A01B: eval4 (eval.c:4325)
==3572==    by 0x439E68: eval3 (eval.c:4237)
==3572==    by 0x439CE7: eval2 (eval.c:4166)
==3572==    by 0x439B26: eval1 (eval.c:4091)
==3572==    by 0x439A85: eval0 (eval.c:4048)
==3572==    by 0x434AC6: eval_to_string (eval.c:1361)
==3572==    by 0x434C37: eval_to_string_safe (eval.c:1409)
==3572==    by 0x415B11: build_stl_str_hl (buffer.c:3859)
==3572==    by 0x55D2A4: win_redr_custom (screen.c:6595)
==3572==    by 0x55CC97: redraw_custom_statusline (screen.c:6382)
==3572==    by 0x55C73F: win_redr_status (screen.c:6244)
==3572==    by 0x55BC8D: redraw_statuslines (screen.c:5860)
==3572==    by 0x4325C3: ins_mouse (edit.c:9136)
==3572==    by 0x425948: edit (edit.c:1147)
==3572==    by 0x513E78: invoke_edit (normal.c:9224)
==3572==    by 0x513E11: nv_edit (normal.c:9197)
==3572==    by 0x505F1E: normal_cmd (normal.c:1199)
==3572==    by 0x4BCA4E: main_loop (main.c:1322)
==3572==    by 0x4BC397: main (main.c:1013)
==3572== 
==3572== Invalid read of size 1
==3572==    at 0x500028: utf_ptr2char (mbyte.c:1698)
==3572==    by 0x415F63: build_stl_str_hl (buffer.c:3964)
==3572==    by 0x55D2A4: win_redr_custom (screen.c:6595)
==3572==    by 0x55CC97: redraw_custom_statusline (screen.c:6382)
==3572==    by 0x55C73F: win_redr_status (screen.c:6244)
==3572==    by 0x55BC8D: redraw_statuslines (screen.c:5860)
==3572==    by 0x4325C3: ins_mouse (edit.c:9136)
==3572==    by 0x425948: edit (edit.c:1147)
==3572==    by 0x513E78: invoke_edit (normal.c:9224)
==3572==    by 0x513E11: nv_edit (normal.c:9197)
==3572==    by 0x505F1E: normal_cmd (normal.c:1199)
==3572==    by 0x4BCA4E: main_loop (main.c:1322)
==3572==    by 0x4BC397: main (main.c:1013)
==3572==  Address 0xdb031b8 is 24 bytes inside a block of size 25 free'd
==3572==    at 0x4C2B6F9: free (vg_replace_malloc.c:446)
==3572==    by 0x4F3FA5: vim_free (misc2.c:1744)
==3572==    by 0x4D1C54: ml_flush_line (memline.c:3481)
==3572==    by 0x4CF974: ml_get_buf (memline.c:2455)
==3572==    by 0x4E4740: plines_win_nofold (misc1.c:1947)
==3572==    by 0x4E46EB: plines_win_nofill (misc1.c:1928)
==3572==    by 0x4E4635: plines_win (misc1.c:1894)
==3572==    by 0x4F9DB1: comp_botline (move.c:95)
==3572==    by 0x4FA930: validate_botline (move.c:573)
==3572==    by 0x4FA1B9: update_topline (move.c:276)
==3572==    by 0x47DD86: update_topline_cursor (ex_docmd.c:9309)
==3572==    by 0x47E2EF: exec_normal_cmd (ex_docmd.c:9538)
==3572==    by 0x47E103: ex_normal (ex_docmd.c:9438)
==3572==    by 0x472AAD: do_one_cmd (ex_docmd.c:2684)
==3572==    by 0x470028: do_cmdline (ex_docmd.c:1122)
==3572==    by 0x4587CC: call_user_func (eval.c:22679)
==3572==    by 0x440437: call_func (eval.c:8506)
==3572==    by 0x43FFC2: get_func_tv (eval.c:8348)
==3572==    by 0x43B814: eval7 (eval.c:5164)
==3572==    by 0x43B0AD: eval6 (eval.c:4816)
==3572==    by 0x43AC1C: eval5 (eval.c:4632)
==3572==    by 0x43A01B: eval4 (eval.c:4325)
==3572==    by 0x439E68: eval3 (eval.c:4237)
==3572==    by 0x439CE7: eval2 (eval.c:4166)
==3572==    by 0x439B26: eval1 (eval.c:4091)
==3572==    by 0x439A85: eval0 (eval.c:4048)
==3572==    by 0x434AC6: eval_to_string (eval.c:1361)
==3572==    by 0x434C37: eval_to_string_safe (eval.c:1409)
==3572==    by 0x415B11: build_stl_str_hl (buffer.c:3859)
==3572==    by 0x55D2A4: win_redr_custom (screen.c:6595)
==3572==    by 0x55CC97: redraw_custom_statusline (screen.c:6382)
==3572==    by 0x55C73F: win_redr_status (screen.c:6244)
==3572==    by 0x55BC8D: redraw_statuslines (screen.c:5860)
==3572==    by 0x4325C3: ins_mouse (edit.c:9136)
==3572==    by 0x425948: edit (edit.c:1147)
==3572==    by 0x513E78: invoke_edit (normal.c:9224)
==3572==    by 0x513E11: nv_edit (normal.c:9197)
==3572==    by 0x505F1E: normal_cmd (normal.c:1199)
==3572==    by 0x4BCA4E: main_loop (main.c:1322)
==3572==    by 0x4BC397: main (main.c:1013)

What is the expected output? What do you see instead?

Vim should not use freed memory.

What version of the product are you using? On what operating system?

Vim-7.3.905 on Linux x86_64 (huge, gtk2)

Please provide any additional information below.

It is not a recently introduced bug, as I could also
reproduce it with an older Vim-7.3.100  (I did try earlier version).

Original issue reported on code.google.com by dominiqu...@gmail.com on 17 Apr 2013 at 9:06

GoogleCodeExporter commented 9 years ago 
Attached patch fixes the use of freed memory.
Please check if this is the best way to fix the issue.

Dominique

Original comment by dominiqu...@gmail.com on 17 Apr 2013 at 10:14

Attachments:

GoogleCodeExporter commented 9 years ago 
Fixed by patch 7.3.916

Original comment by brammool...@gmail.com on 24 Apr 2013 at 2:45