atm: br2684: Avoid alignment issues

Use memcmp() instead of cast to u16 when checking the PAD field.

Signed-off-by: Pascal Hambourg <pascal@plouf.fr.eu.org>
Signed-off-by: chas williams - CONTRACTOR <chas@cmf.nrl.navy.mil>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 1 deletions

diff --git a/net/atm/br2684.c b/net/atm/br2684.c
index ed72263d0dc7..353fccf1cde3 100644
--- a/net/atm/br2684.c
+++ b/net/atm/br2684.c
@@ -53,6 +53,7 @@ static const unsigned char ethertype_ipv4[] = { ETHERTYPE_IPV4 };
 static const unsigned char ethertype_ipv6[] = { ETHERTYPE_IPV6 };
 static const unsigned char llc_oui_pid_pad[] =
                         { LLC, SNAP_BRIDGED, PID_ETHERNET, PAD_BRIDGED };
+static const unsigned char pad[] = { PAD_BRIDGED };
 static const unsigned char llc_oui_ipv4[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV4 };
 static const unsigned char llc_oui_ipv6[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV6 };
 
@@ -453,7 +454,7 @@ static void br2684_push(struct atm_vcc *atmvcc, struct sk_buff *skb)
                         skb->pkt_type = PACKET_HOST;
                 } else { /* p_bridged */
                         /* first 2 chars should be 0 */
-                        if (*((u16 *) (skb->data)) != 0)
+                        if (memcmp(skb->data, pad, BR2684_PAD_LEN) != 0)
                                 goto error;
                         skb_pull(skb, BR2684_PAD_LEN);
                         skb->protocol = eth_type_trans(skb, net_dev);