switchdev: check if the vlan id is in the proper vlan range

VLANs 0 and 4095 are reserved and shouldn't be used, add checks to
switchdev similar to the bridge. Also make sure ids above 4095 cannot
be passed either.

Fixes: 47f8328bb1a4 ("switchdev: add new switchdev bridge setlink")
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Acked-by: Scott Feldman <sfeldma@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/switchdev/switchdev.c b/net/switchdev/switchdev.c
index fda38f830a10869713177220f8d2066c6076da0c..77f5d17e261230a6db4f261445311eafb37c7b06 100644 (file)
--- a/net/switchdev/switchdev.c
+++ b/net/switchdev/switchdev.c
@@ -16,6 +16,7 @@
 #include <linux/notifier.h>
 #include <linux/netdevice.h>
 #include <linux/if_bridge.h>
+#include <linux/if_vlan.h>
 #include <net/ip_fib.h>
 #include <net/switchdev.h>
 
@@ -634,6 +635,8 @@ static int switchdev_port_br_afspec(struct net_device *dev,
                if (nla_len(attr) != sizeof(struct bridge_vlan_info))
                        return -EINVAL;
                vinfo = nla_data(attr);
+               if (!vinfo->vid || vinfo->vid >= VLAN_VID_MASK)
+                       return -EINVAL;
                vlan->flags = vinfo->flags;
                if (vinfo->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN) {
                        if (vlan->vid_begin)