[patch 16/26] Add get_unaligned to ieee80211_get_radiotap_len

[Greg KH <gregkh@suse.de>]

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2.6.22-stable review patch.  If anyone has any objections, please let us
know.

------------------

From: Andy Green <andy@warmcat.com>

patch dfe6e81deaa79c85086c0cc8d85b229e444ab97f in mainline.

ieee80211_get_radiotap_len() tries to dereference radiotap length without
taking care that it is completely unaligned and get_unaligned()
is required.

Signed-off-by: Andy Green <andy@warmcat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 net/mac80211/ieee80211.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/net/mac80211/ieee80211.c
+++ b/net/mac80211/ieee80211.c
@@ -24,6 +24,7 @@
 #include <linux/compiler.h>
 #include <linux/bitmap.h>
 #include <net/cfg80211.h>
+#include <asm/unaligned.h>
 
 #include "ieee80211_common.h"
 #include "ieee80211_i.h"
@@ -338,7 +339,7 @@ static int ieee80211_get_radiotap_len(st
 	struct ieee80211_radiotap_header *hdr =
 		(struct ieee80211_radiotap_header *) skb->data;
 
-	return le16_to_cpu(hdr->it_len);
+	return le16_to_cpu(get_unaligned(&hdr->it_len));
 }
 
 #ifdef CONFIG_MAC80211_LOWTX_FRAME_DUMP

--