[PPP] pppoe: Fix skb_unshare_check call position

The skb_unshare_check call needs to be made before pskb_may_pull,
not after.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/net/pppoe.c b/drivers/net/pppoe.c
index 68631a5721a..5ac3eff6a2a 100644
--- a/drivers/net/pppoe.c
+++ b/drivers/net/pppoe.c
@@ -385,12 +385,12 @@ static int pppoe_rcv(struct sk_buff *skb,
         struct pppoe_hdr *ph;
         struct pppox_sock *po;
 
-        if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr)))
-                goto drop;
-
         if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
                 goto out;
 
+        if (!pskb_may_pull(skb, sizeof(struct pppoe_hdr)))
+                goto drop;
+
         ph = pppoe_hdr(skb);
 
         po = get_item((unsigned long) ph->sid, eth_hdr(skb)->h_source, dev->ifindex);