bridge: Fix double free and memory leak around br_allowed_ingress

[ Upstream commit eb7076182d1ae4bc4641534134ed707100d76acc ]

br_allowed_ingress() has two problems.

1. If br_allowed_ingress() is called by br_handle_frame_finish() and
vlan_untag() in br_allowed_ingress() fails, skb will be freed by both
vlan_untag() and br_handle_frame_finish().

2. If br_allowed_ingress() is called by br_dev_xmit() and
br_allowed_ingress() fails, the skb will not be freed.

Fix these two problems by freeing the skb in br_allowed_ingress()
if it fails.

Signed-off-by: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>

diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
index a2fd37ec35f7d26a0755f351d4104e9b02f0bb3a..c378750602cd67b97e097e0b70402373cca31ccc 100644 (file)
--- a/net/bridge/br_input.c
+++ b/net/bridge/br_input.c
@@ -72,7 +72,7 @@ int br_handle_frame_finish(struct sk_buff *skb)
                goto drop;
 
        if (!br_allowed_ingress(p->br, nbp_get_vlan_info(p), skb, &vid))
-               goto drop;
+               goto out;
 
        /* insert into forwarding database after filtering to avoid spoofing */
        br = p->br;

diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c
index 53f0990eab58e08a3da9160a27ee0834bd0f0272..45a26debe64efd6bb16e9796511acf7dd91bd005 100644 (file)
--- a/net/bridge/br_vlan.c
+++ b/net/bridge/br_vlan.c
@@ -201,7 +201,7 @@ bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v,
         * rejected.
         */
        if (!v)
-               return false;
+               goto drop;
 
        err = br_vlan_get_tag(skb, vid);
        if (!*vid) {
@@ -212,7 +212,7 @@ bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v,
                 * vlan untagged or priority-tagged traffic belongs to.
                 */
                if (pvid == VLAN_N_VID)
-                       return false;
+                       goto drop;
 
                /* PVID is set on this port.  Any untagged or priority-tagged
                 * ingress frame is considered to belong to this vlan.
@@ -235,7 +235,8 @@ bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v,
        /* Frame had a valid vlan tag.  See if vlan is allowed */
        if (test_bit(*vid, v->vlan_bitmap))
                return true;
-
+drop:
+       kfree_skb(skb);
        return false;
 }