diff options
| author | Johan Hovold <johan@kernel.org> | 2017-01-31 19:17:29 +0300 |
|---|---|---|
| committer | Johan Hovold <johan@kernel.org> | 2017-01-31 20:33:00 +0300 |
| commit | c528fcb116e61afc379a2e0a0f70906b937f1e2c (patch) | |
| tree | 4140133888712a6f6c210954dfd04d97dbe55bc7 /drivers/usb/serial/keyspan_pda.c | |
| parent | 1b0aed2b1600f6e5c7b9acfbd610a4e351ef5232 (diff) | |
| download | linux-c528fcb116e61afc379a2e0a0f70906b937f1e2c.tar.xz | |
USB: serial: keyspan_pda: fix receive sanity checks
Make sure to check for short transfers before parsing the receive buffer
to avoid acting on stale data.
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Diffstat (limited to 'drivers/usb/serial/keyspan_pda.c')
| -rw-r--r-- | drivers/usb/serial/keyspan_pda.c | 19 |
1 files changed, 14 insertions, 5 deletions
diff --git a/drivers/usb/serial/keyspan_pda.c b/drivers/usb/serial/keyspan_pda.c index 83523fcf6fb9..d2dab2a341b8 100644 --- a/drivers/usb/serial/keyspan_pda.c +++ b/drivers/usb/serial/keyspan_pda.c @@ -139,6 +139,7 @@ static void keyspan_pda_rx_interrupt(struct urb *urb) { struct usb_serial_port *port = urb->context; unsigned char *data = urb->transfer_buffer; + unsigned int len = urb->actual_length; int retval; int status = urb->status; struct keyspan_pda_private *priv; @@ -159,18 +160,26 @@ static void keyspan_pda_rx_interrupt(struct urb *urb) goto exit; } + if (len < 1) { + dev_warn(&port->dev, "short message received\n"); + goto exit; + } + /* see if the message is data or a status interrupt */ switch (data[0]) { case 0: /* rest of message is rx data */ - if (urb->actual_length) { - tty_insert_flip_string(&port->port, data + 1, - urb->actual_length - 1); - tty_flip_buffer_push(&port->port); - } + if (len < 2) + break; + tty_insert_flip_string(&port->port, data + 1, len - 1); + tty_flip_buffer_push(&port->port); break; case 1: /* status interrupt */ + if (len < 3) { + dev_warn(&port->dev, "short interrupt message received\n"); + break; + } dev_dbg(&port->dev, "rx int, d1=%d, d2=%d\n", data[1], data[2]); switch (data[1]) { case 1: /* modemline change */ |