1 files changed, 8 insertions, 2 deletions

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 0476549841ac..4825c52924bf 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -260,10 +260,16 @@ static int update_filter(struct tap_filter *filter, void __user *arg)
 
         nexact = n;
 
-        /* The rest is hashed */
+        /* Remaining multicast addresses are hashed,
+         * unicast will leave the filter disabled. */
         memset(filter->mask, 0, sizeof(filter->mask));
-        for (; n < uf.count; n++)
+        for (; n < uf.count; n++) {
+                if (!is_multicast_ether_addr(addr[n].u)) {
+                        err = 0; /* no filter */
+                        goto done;
+                }
                 addr_hash_set(filter->mask, addr[n].u);
+        }
 
         /* For ALLMULTI just set the mask to all ones.
          * This overrides the mask populated above. */