mac80211 : fix unaligned rx skb

mac80211 is checking is the skb is aligned on 32 bit boundary.
But it is checking against ethernet header, whereas Linux expect IP
header aligned.  And ethernet ether size is 6*2+2=14, so aligning
ethernet header make IP header unaligned.

Signed-off-by: Matthieu CASTET <castet.matthieu@free.fr>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 6a9b8e63a6bfe8cbf844600b41c09923636f8e2a..754125185109f75d8e654379d6c94901e9bc1e41 100644 (file)
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -1335,7 +1335,7 @@ ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
                 * mac80211. That also explains the __skb_push()
                 * below.
                 */
-               align = (unsigned long)skb->data & 3;
+               align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3;
                if (align) {
                        if (WARN_ON(skb_headroom(skb) < 3)) {
                                dev_kfree_skb(skb);