[PATCH] ieee80211: Fix kernel panic when QoS is enabled

The 802.11 header length is affected by the wireless mode (WDS or not) and
type (QoS or not). We should use the variable hdr_len instead of the
hard coded IEEE80211_3ADDR_LEN, otherwise we may touch invalid memory.

Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/ieee80211/ieee80211_tx.c b/net/ieee80211/ieee80211_tx.c
index ae25449..854fc13 100644
--- a/net/ieee80211/ieee80211_tx.c
+++ b/net/ieee80211/ieee80211_tx.c
@@ -390,7 +390,7 @@
 		 * this stack is providing the full 802.11 header, one will
 		 * eventually be affixed to this fragment -- so we must account
 		 * for it when determining the amount of payload space. */
-		bytes_per_frag = frag_size - IEEE80211_3ADDR_LEN;
+		bytes_per_frag = frag_size - hdr_len;
 		if (ieee->config &
 		    (CFG_IEEE80211_COMPUTE_FCS | CFG_IEEE80211_RESERVE_FCS))
 			bytes_per_frag -= IEEE80211_FCS_LEN;
@@ -412,7 +412,7 @@
 	} else {
 		nr_frags = 1;
 		bytes_per_frag = bytes_last_frag = bytes;
-		frag_size = bytes + IEEE80211_3ADDR_LEN;
+		frag_size = bytes + hdr_len;
 	}
 
 	rts_required = (frag_size > ieee->rts