summaryrefslogtreecommitdiff
path: root/drivers/usb
diff options
context:
space:
mode:
authorJohan Hovold <johan@kernel.org>2017-05-11 11:41:21 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-05-25 14:30:13 +0200
commit1e6e9c4c36f9626d5ad2b63aa7ad5686dde737e7 (patch)
tree8a5e2dd882d333d34ccc7282f902d3fb81d76ef7 /drivers/usb
parent4be0ae3d314c197865bc742069fa7f66e22ee8bf (diff)
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/usb')
-rw-r--r--drivers/usb/serial/io_ti.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/usb/serial/io_ti.c b/drivers/usb/serial/io_ti.c
index f1a8fdcd8674..e98532feb0cc 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);