6lowpan: cleanup skb copy data

This patch drops the direct memcpy on skb and uses the right skb
memcpy functions. Also remove an unnecessary check if plen is non zero.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Reviewed-by: Werner Almesberger <werner@almesberger.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 8 insertions, 5 deletions

diff --git a/net/ieee802154/6lowpan.c b/net/ieee802154/6lowpan.c
index 58c07fd967d1..9497c6f3276b 100644
--- a/net/ieee802154/6lowpan.c
+++ b/net/ieee802154/6lowpan.c
@@ -1122,12 +1122,15 @@ lowpan_fragment_xmit(struct sk_buff *skb, u8 *head,
         frag->priority = skb->priority;
 
         /* copy header, MFR and payload */
-        memcpy(skb_put(frag, mlen), skb->data, mlen);
-        memcpy(skb_put(frag, hlen), head, hlen);
+        skb_put(frag, mlen);
+        skb_copy_to_linear_data(frag, skb_mac_header(skb), mlen);
 
-        if (plen)
-                skb_copy_from_linear_data_offset(skb, offset + mlen,
-                                        skb_put(frag, plen), plen);
+        skb_put(frag, hlen);
+        skb_copy_to_linear_data_offset(frag, mlen, head, hlen);
+
+        skb_put(frag, plen);
+        skb_copy_to_linear_data_offset(frag, mlen + hlen,
+                                       skb_network_header(skb) + offset, plen);
 
         lowpan_raw_dump_table(__func__, " raw fragment dump", frag->data,
                                                                 frag->len);