rtnetlink: Fix regression in bridge VLAN configuration

[ Upstream commit d2e381c4963663bca6f30c3b996fa4dbafe8fcb5 ]

Cited commit started returning errors when notification info is not
filled by the bridge driver, resulting in the following regression:

 # ip link add name br1 type bridge vlan_filtering 1
 # bridge vlan add dev br1 vid 555 self pvid untagged
 RTNETLINK answers: Invalid argument

As long as the bridge driver does not fill notification info for the
bridge device itself, an empty notification should not be considered as
an error. This is explained in commit 59ccaaaa49b5 ("bridge: dont send
notification when skb->len == 0 in rtnl_bridge_notify").

Fix by removing the error and add a comment to avoid future bugs.

Fixes: a8db57c1d285 ("rtnetlink: Fix missing error code in rtnl_bridge_notify()")
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Nikolay Aleksandrov <nikolay@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 11d2da8abd73138eb1be3dae91cf6ef94fe3f04d..7d6fe9ba9a248a3de15298960b7fdc7dcbd7875d 100644 (file)
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -3240,10 +3240,12 @@ static int rtnl_bridge_notify(struct net_device *dev)
        if (err < 0)
                goto errout;
 
-       if (!skb->len) {
-               err = -EINVAL;
+       /* Notification info is only filled for bridge ports, not the bridge
+        * device itself. Therefore, a zero notification length is valid and
+        * should not result in an error.
+        */
+       if (!skb->len)
                goto errout;
-       }
 
        rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
        return 0;