mac80211: correct header length calculation

HT Control field may also be present in management frames, as defined
in 8.2.4.1.10 of 802.11-2012. Account for this in calculation of header
length.

Signed-off-by: Fred Chou <fred.chou.nd@gmail.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/net/wireless/util.c b/net/wireless/util.c
index d0ac795445b7e40dc92ebb1e0bd9095fc4bab048..5488c3662f7d7671c184215ae1d74faf0190b126 100644 (file)
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -308,6 +308,12 @@ unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
                goto out;
        }
 
+       if (ieee80211_is_mgmt(fc)) {
+               if (ieee80211_has_order(fc))
+                       hdrlen += IEEE80211_HT_CTL_LEN;
+               goto out;
+       }
+
        if (ieee80211_is_ctl(fc)) {
                /*
                 * ACK and CTS are 10 bytes, all others 16. To see how