Commit 2cd394cd authored by Johan Hovold's avatar Johan Hovold Committed by Sasha Levin

USB: serial: io_ti: fix div-by-zero in set_termios

[ Upstream commit 6aeb75e6 ]

Fix a division-by-zero in set_termios when debugging is enabled and a
high-enough speed has been requested so that the divisor value becomes
zero.

Instead of just fixing the offending debug statement, cap the baud rate
at the base as a zero divisor value also appears to crash the firmware.

Fixes: 1da177e4 ("Linux-2.6.12-rc2")
Cc: stable <stable@vger.kernel.org>     # 2.6.12
Reviewed-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: default avatarJohan Hovold <johan@kernel.org>
Signed-off-by: default avatarSasha Levin <alexander.levin@verizon.com>
parent a1dfb570
......@@ -2210,8 +2210,11 @@ static void change_port_settings(struct tty_struct *tty,
if (!baud) {
/* pick a default, any default... */
baud = 9600;
} else
} else {
/* Avoid a zero divisor. */
baud = min(baud, 461550);
tty_encode_baud_rate(tty, baud, baud);
}
edge_port->baud_rate = baud;
config->wBaudRate = (__u16)((461550L + baud/2) / baud);
......
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