8021q: fix a potential memory leak
authorLi RongQing <roy.qing.li@gmail.com>
Wed, 18 Jun 2014 05:46:02 +0000 (13:46 +0800)
committerDavid S. Miller <davem@davemloft.net>
Sat, 21 Jun 2014 22:12:13 +0000 (15:12 -0700)
skb_cow called in vlan_reorder_header does not free the skb when it failed,
and vlan_reorder_header returns NULL to reset original skb when it is called
in vlan_untag, lead to a memory leak.

Signed-off-by: Li RongQing <roy.qing.li@gmail.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/8021q/vlan_core.c

index 9012b1c922b61acd28fffb7f50b4968da9293b2f..75d427763992b1b4bb47c782ead2d2300ffb61c3 100644 (file)
@@ -114,8 +114,11 @@ EXPORT_SYMBOL(vlan_dev_vlan_proto);
 
 static struct sk_buff *vlan_reorder_header(struct sk_buff *skb)
 {
-       if (skb_cow(skb, skb_headroom(skb)) < 0)
+       if (skb_cow(skb, skb_headroom(skb)) < 0) {
+               kfree_skb(skb);
                return NULL;
+       }
+
        memmove(skb->data - ETH_HLEN, skb->data - VLAN_ETH_HLEN, 2 * ETH_ALEN);
        skb->mac_header += VLAN_HLEN;
        return skb;