can: Proper ctrlmode handling for CAN devices

This patch adds error checking of ctrlmode values for CAN devices. As
an example all availabe bits are implemented in the mcp251x driver.

Signed-off-by: Christian Pellegrin <chripell@fsfe.org>
Acked-by: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/net/can/dev.c b/drivers/net/can/dev.c
index c1bb29f0322b..f08f1202ff00 100644
--- a/drivers/net/can/dev.c
+++ b/drivers/net/can/dev.c
@@ -592,6 +592,8 @@ static int can_changelink(struct net_device *dev,
                 if (dev->flags & IFF_UP)
                         return -EBUSY;
                 cm = nla_data(data[IFLA_CAN_CTRLMODE]);
+                if (cm->flags & ~priv->ctrlmode_supported)
+                        return -EOPNOTSUPP;
                 priv->ctrlmode &= ~cm->mask;
                 priv->ctrlmode |= cm->flags;
         }