l2tp: fix a potential skb leak in l2tp_xmit_skb()
authorEric Dumazet <eric.dumazet@gmail.com>
Fri, 7 Oct 2011 05:35:46 +0000 (05:35 +0000)
committerDavid S. Miller <davem@davemloft.net>
Wed, 19 Oct 2011 03:32:00 +0000 (23:32 -0400)
l2tp_xmit_skb() can leak one skb if skb_cow_head() returns an error.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/l2tp/l2tp_core.c

index ad4ac2601a569ccb7b95e36a9c83fac58fc4693b..34b2ddeacb673b3b8d4f3e92bf726fc567c49a81 100644 (file)
@@ -1045,8 +1045,10 @@ int l2tp_xmit_skb(struct l2tp_session *session, struct sk_buff *skb, int hdr_len
        headroom = NET_SKB_PAD + sizeof(struct iphdr) +
                uhlen + hdr_len;
        old_headroom = skb_headroom(skb);
-       if (skb_cow_head(skb, headroom))
+       if (skb_cow_head(skb, headroom)) {
+               dev_kfree_skb(skb);
                goto abort;
+       }
 
        new_headroom = skb_headroom(skb);
        skb_orphan(skb);