n_tty: Reset lnext if canonical mode changes
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>
diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index c7f71cb..e63beab 100644
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -1574,6 +1574,7 @@
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))