ath5k: explicitly check skb->len

ieee80211_get_hdrlen_from_skb internally checks that the skb is long
enough to hold the full header, or it returns 0 if not.  The check in
ath5k does not check this case and assumes it always got the actual
header length which it then checks against the skb->len plus some headroom.

Change to ieee80211_hdrlen which always returns the hdrlen and keep the
existing headroom check.

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/net/wireless/ath5k/base.c b/drivers/net/wireless/ath5k/base.c
index 114520258b78..c1de1ef09e59 100644
--- a/drivers/net/wireless/ath5k/base.c
+++ b/drivers/net/wireless/ath5k/base.c
@@ -1540,7 +1540,7 @@ ath5k_rx_decrypted(struct ath5k_softc *sc, struct ath5k_desc *ds,
                 struct sk_buff *skb, struct ath5k_rx_status *rs)
 {
         struct ieee80211_hdr *hdr = (void *)skb->data;
-        unsigned int keyix, hlen = ieee80211_get_hdrlen_from_skb(skb);
+        unsigned int keyix, hlen;
 
         if (!(rs->rs_status & AR5K_RXERR_DECRYPT) &&
                         rs->rs_keyix != AR5K_RXKEYIX_INVALID)
@@ -1549,6 +1549,7 @@ ath5k_rx_decrypted(struct ath5k_softc *sc, struct ath5k_desc *ds,
         /* Apparently when a default key is used to decrypt the packet
            the hw does not set the index used to decrypt.  In such cases
            get the index from the packet. */
+        hlen = ieee80211_hdrlen(hdr->frame_control);
         if (ieee80211_has_protected(hdr->frame_control) &&
             !(rs->rs_status & AR5K_RXERR_DECRYPT) &&
             skb->len >= hlen + 4) {