From: Johan Hovold <[email protected]>
3.12-stable review patch. If anyone has any objections, please let me know.
===============
commit 427c3a95e3e29e65f59d99aaf320d7506f3eed57 upstream.
Make sure to detect short responses when fetching the modem status in
order to avoid parsing uninitialised buffer data and having bits of it
leak to user space.
Note that we still allow for short 1-byte responses.
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Reviewed-by: Greg Kroah-Hartman <[email protected]>
Signed-off-by: Johan Hovold <[email protected]>
Signed-off-by: Jiri Slaby <[email protected]>
---
drivers/usb/serial/ftdi_sio.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index d1b76b0a67df..5ed104787474 100644
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -2465,8 +2465,12 @@ static int ftdi_get_modem_status(struct usb_serial_port
*port,
FTDI_SIO_GET_MODEM_STATUS_REQUEST_TYPE,
0, priv->interface,
buf, len, WDR_TIMEOUT);
- if (ret < 0) {
+
+ /* NOTE: We allow short responses and handle that below. */
+ if (ret < 1) {
dev_err(&port->dev, "failed to get modem status: %d\n", ret);
+ if (ret >= 0)
+ ret = -EIO;
ret = usb_translate_errors(ret);
goto out;
}
--
2.12.0
