[NET] snap: needs hardware checksum fix

The SNAP code pops off it's 5 byte header, but doesn't adjust
the checksum. This would cause problems when using device that
does IP over SNAP and hardware receive checksums.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 0 deletions

diff --git a/net/802/psnap.c b/net/802/psnap.c
index 4d638944d933..34e42968b477 100644
--- a/net/802/psnap.c
+++ b/net/802/psnap.c
@@ -59,8 +59,10 @@ static int snap_rcv(struct sk_buff *skb, struct net_device *dev,
         proto = find_snap_client(skb->h.raw);
         if (proto) {
                 /* Pass the frame on. */
+                u8 *hdr = skb->data;
                 skb->h.raw  += 5;
                 skb_pull(skb, 5);
+                skb_postpull_rcsum(skb, hdr, 5);
                 rc = proto->rcvfunc(skb, dev, &snap_packet_type, orig_dev);
         } else {
                 skb->sk = NULL;