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vim-patch:9.0.2107: [security]: FPE in adjust_plines_for_skipcol (#26082)

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Problem:  [security]: FPE in adjust_plines_for_skipcol
Solution: don't divide by zero, return zero

Prevent a floating point exception when calculating w_skipcol (which can
happen with a small window when the number option is set and cpo+=n).

Add a test to verify

cb0b99f067

Co-authored-by: Christian Brabandt <cb@256bit.org>
This commit is contained in:
zeertzjq
2023-11-17 08:40:02 +08:00
committed by GitHub
parent 133a592d19
commit 6952b1951b
8 changed files with 61 additions and 28 deletions
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6
src/nvim/plines.c
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@@ -83,18 +83,18 @@ int linetabsize_col(int startcol, char *s)
/// @param len
///
/// @return Number of characters the string will take on the screen.
unsigned win_linetabsize(win_T *wp, linenr_T lnum, char *line, colnr_T len)
int win_linetabsize(win_T *wp, linenr_T lnum, char *line, colnr_T len)
{
chartabsize_T cts;
init_chartabsize_arg(&cts, wp, lnum, 0, line, line);
win_linetabsize_cts(&cts, len);
clear_chartabsize_arg(&cts);
return (unsigned)cts.cts_vcol;
return cts.cts_vcol;
}
/// Return the number of cells line "lnum" of window "wp" will take on the
/// screen, taking into account the size of a tab and inline virtual text.
unsigned linetabsize(win_T *wp, linenr_T lnum)
int linetabsize(win_T *wp, linenr_T lnum)
{
return win_linetabsize(wp, lnum, ml_get_buf(wp->w_buffer, lnum), (colnr_T)MAXCOL);
}