bridge: Fix enforcement of multicast hash_max limit

The hash size is doubled when it needs to grow and compared against
hash_max. The >= comparison will limit the hash table size to half
of what is expected i.e. the default 512 hash_max will not allow
the hash table to grow larger than 256.

Also print the hash table limit instead of the desirable size when
the limit is reached.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 4 deletions

diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index 2d9a0663b848..241743417f49 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -540,10 +540,11 @@ static struct net_bridge_mdb_entry *br_multicast_get_group(
 
         if (mdb->size >= max) {
                 max *= 2;
-                if (unlikely(max >= br->hash_max)) {
-                        br_warn(br, "Multicast hash table maximum "
-                                "reached, disabling snooping: %s, %d\n",
-                                port ? port->dev->name : br->dev->name, max);
+                if (unlikely(max > br->hash_max)) {
+                        br_warn(br, "Multicast hash table maximum of %d "
+                                "reached, disabling snooping: %s\n",
+                                br->hash_max,
+                                port ? port->dev->name : br->dev->name);
                         err = -E2BIG;
 disable:
                         br->multicast_disabled = 1;