diff -up vim80/src/regexp.c.cve4192 vim80/src/regexp.c --- vim80/src/regexp.c.cve4192 2022-01-12 15:21:44.792239040 +0100 +++ vim80/src/regexp.c 2022-01-12 15:34:35.190425880 +0100 @@ -4203,9 +4203,9 @@ reg_match_visual(void) if (lnum < top.lnum || lnum > bot.lnum) return FALSE; + col = (colnr_T)(reginput - regline); if (mode == 'v') { - col = (colnr_T)(reginput - regline); if ((lnum == top.lnum && col < top.col) || (lnum == bot.lnum && col >= bot.col + (*p_sel != 'e'))) return FALSE; @@ -4220,7 +4220,12 @@ reg_match_visual(void) end = end2; if (top.col == MAXCOL || bot.col == MAXCOL) end = MAXCOL; - cols = win_linetabsize(wp, regline, (colnr_T)(reginput - regline)); + + // getvvcol() flushes rex.line, need to get it again + regline = reg_getline(reglnum); + reginput = regline + col; + + cols = win_linetabsize(wp, regline, col); if (cols < start || cols > end - (*p_sel == 'e')) return FALSE; } diff -up vim80/src/testdir/test_regexp_latin.vim.cve4192 vim80/src/testdir/test_regexp_latin.vim --- vim80/src/testdir/test_regexp_latin.vim.cve4192 2022-01-12 15:21:44.792239040 +0100 +++ vim80/src/testdir/test_regexp_latin.vim 2022-01-12 15:36:12.499693099 +0100 @@ -80,3 +80,13 @@ func Test_using_invalid_visual_position( /\%V bwipe! endfunc + +func Test_using_visual_position() + " this was using freed memory + new + exe "norm 0o\\k\o0" + /\%V + bwipe! +endfunc + +" vim: shiftwidth=2 sts=2 expandtab