diff options
| author | Johan Hovold <johan@kernel.org> | 2017-05-11 09:41:21 (GMT) |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-05-25 13:44:40 (GMT) |
| commit | f9cd79e0ad1fa620ff34715d24ae1b671c97bc91 (patch) | |
| tree | 6c602abae609be27268a38921def55b0927e0629 /drivers | |
| parent | c3e024ff91806856059c2fad64ad535bf6bf37eb (diff) | |
| download | linux-f9cd79e0ad1fa620ff34715d24ae1b671c97bc91.tar.xz | |
USB: serial: io_ti: fix div-by-zero in set_termios
commit 6aeb75e6adfaed16e58780309613a578fe1ee90b upstream.
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: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/usb/serial/io_ti.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/usb/serial/io_ti.c b/drivers/usb/serial/io_ti.c index f1a8fdc..e98532f 100644 --- a/drivers/usb/serial/io_ti.c +++ b/drivers/usb/serial/io_ti.c @@ -2349,8 +2349,11 @@ 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); |