ieee802154: fix skb get fc on big endian

This patch fixes ieee802154_get_fc_from_skb function on big endian
machines. The function get_unaligned_le16 converts the byte order to
host byte order but we want to keep the byte order like in mac header.

Signed-off-by: Alexander Aring <aar@pengutronix.de>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/include/net/mac802154.h b/include/net/mac802154.h
index d757edd0b0b7..bb7bfecc5ab3 100644
--- a/include/net/mac802154.h
+++ b/include/net/mac802154.h
@@ -247,6 +247,8 @@ struct ieee802154_ops {
  */
 static inline __le16 ieee802154_get_fc_from_skb(const struct sk_buff *skb)
 {
+        __le16 fc;
+
         /* check if we can fc at skb_mac_header of sk buffer */
         if (unlikely(!skb_mac_header_was_set(skb) ||
                      (skb_tail_pointer(skb) - skb_mac_header(skb)) < 2)) {
@@ -254,7 +256,8 @@ static inline __le16 ieee802154_get_fc_from_skb(const struct sk_buff *skb)
                 return cpu_to_le16(0);
         }
 
-        return get_unaligned_le16(skb_mac_header(skb));
+        memcpy(&fc, skb_mac_header(skb), IEEE802154_FC_LEN);
+        return fc;
 }
 
 /**