USB: serial: keyspan: handle unbound ports

[ Upstream commit 3018dd3fa114b13261e9599ddb5656ef97a1fa17 ]

Check for NULL port data in the control URB completion handlers to avoid
dereferencing a NULL pointer in the unlikely case where a port device
isn't bound to a driver (e.g. after an allocation failure on port
probe()).

Fixes: 0ca1268e109a ("USB Serial Keyspan: add support for USA-49WG & USA-28XG")
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: stable <stable@vger.kernel.org>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/usb/serial/keyspan.c b/drivers/usb/serial/keyspan.c
index 38112be..a79e9ad 100644 (file)
--- a/drivers/usb/serial/keyspan.c
+++ b/drivers/usb/serial/keyspan.c
@@ -565,6 +565,8 @@ static void usa49_glocont_callback(struct urb *urb)
        for (i = 0; i < serial->num_ports; ++i) {
                port = serial->port[i];
                p_priv = usb_get_serial_port_data(port);
+               if (!p_priv)
+                       continue;
 
                if (p_priv->resend_cont) {
                        dev_dbg(&port->dev, "%s - sending setup\n", __func__);
@@ -962,6 +964,8 @@ static void usa67_glocont_callback(struct urb *urb)
        for (i = 0; i < serial->num_ports; ++i) {
                port = serial->port[i];
                p_priv = usb_get_serial_port_data(port);
+               if (!p_priv)
+                       continue;
 
                if (p_priv->resend_cont) {
                        dev_dbg(&port->dev, "%s - sending setup\n", __func__);