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n_tty: Reset lnext if canonical mode changes

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lnext escapes the next input character as a literal, and must
be reset when canonical mode changes (to avoid misinterpreting
a special character as a literal if canonical mode is changed
back again).

lnext is specifically not reset on a buffer flush so as to avoid
misinterpreting the next input character as a special character.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Hurley 2013-06-15 09:14:27 -04:00 committed by Greg Kroah-Hartman
parent 6d76bd2618
commit 6f9b028a8f
1 changed files with 1 additions and 0 deletions
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drivers/tty/n_tty.c
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@ -1574,6 +1574,7 @@ static void n_tty_set_termios(struct tty_struct *tty, struct ktermios *old)
bitmap_zero(ldata->read_flags, N_TTY_BUF_SIZE);
ldata->canon_head = ldata->read_tail;
ldata->erasing = 0;
ldata->lnext = 0;
}
if (canon_change && !L_ICANON(tty) && read_cnt(ldata))