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Don't truncate cursor arithmetic to 16 bits.

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When updating the row number when the cursor position escape sequence is
issued, we should make sure to store the intermediate result in a 32-bit
integer. If we fail to do this, the cursor may be set above the origin
region, which is bad.

This could cause libteken to crash when INVARIANTS is enabled, due to
the strict set of assertions that libteken has.

PR:		202540
Reported by:	kcwu csie org
MFC after:	1 month
This commit is contained in:
Ed Schouten 2015-08-21 06:30:13 +00:00
parent 328b9e0bca
commit 9a71fa376b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=286981
1 changed files with 6 additions and 6 deletions
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12
sys/teken/teken_subr.h
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@ -324,13 +324,13 @@ static void
teken_subr_cursor_position(teken_t *t, unsigned int row, unsigned int col)
{
t->t_cursor.tp_row = t->t_originreg.ts_begin + row - 1;
if (t->t_cursor.tp_row >= t->t_originreg.ts_end)
t->t_cursor.tp_row = t->t_originreg.ts_end - 1;
row = row - 1 + t->t_originreg.ts_begin;
t->t_cursor.tp_row = row < t->t_originreg.ts_end ?
row : t->t_originreg.ts_end - 1;
t->t_cursor.tp_col = col - 1;
if (t->t_cursor.tp_col >= t->t_winsize.tp_col)
t->t_cursor.tp_col = t->t_winsize.tp_col - 1;
col--;
t->t_cursor.tp_col = col < t->t_winsize.tp_col ?
col : t->t_winsize.tp_col - 1;
t->t_stateflags &= ~TS_WRAPPED;
teken_funcs_cursor(t);