hsr: check protocol version in hsr_newlink()

In the current hsr code, only 0 and 1 protocol versions are valid.
But current hsr code doesn't check the version, which is received by
userspace.

Test commands:
    ip link add dummy0 type dummy
    ip link add dummy1 type dummy
    ip link add hsr0 type hsr slave1 dummy0 slave2 dummy1 version 4

In the test commands, version 4 is invalid.
So, the command should be failed.

After this patch, following error will occur.
"Error: hsr: Only versions 0..1 are supported."

Fixes: ee1c27977284 ("net/hsr: Added support for HSR v1")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/hsr/hsr_netlink.c b/net/hsr/hsr_netlink.c
index 5465a39..1decb25 100644 (file)
--- a/net/hsr/hsr_netlink.c
+++ b/net/hsr/hsr_netlink.c
@@ -69,10 +69,16 @@ static int hsr_newlink(struct net *src_net, struct net_device *dev,
        else
                multicast_spec = nla_get_u8(data[IFLA_HSR_MULTICAST_SPEC]);
 
-       if (!data[IFLA_HSR_VERSION])
+       if (!data[IFLA_HSR_VERSION]) {
                hsr_version = 0;
-       else
+       } else {
                hsr_version = nla_get_u8(data[IFLA_HSR_VERSION]);
+               if (hsr_version > 1) {
+                       NL_SET_ERR_MSG_MOD(extack,
+                                          "Only versions 0..1 are supported");
+                       return -EINVAL;
+               }
+       }
 
        return hsr_dev_finalize(dev, link, multicast_spec, hsr_version, extack);
 }