mac80211: validate TIM IE length (redux)

The TIM IE must not be shorter than 4 bytes, so verify that
when parsing it and use the proper type. To ease that adjust
struct ieee80211_tim_ie to have a virtual bitmap of size
at least 1.

Also check that the TIM IE is actually present before trying
to parse it!

Because other people may need the function, make it a static
inline in ieee80211.h.

(The original "mac80211: validate TIM IE length" was a minimal fix for
2.6.30.  This purports to be the full, correct fix. -- JWL)

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index dba78d89a10c..1579bc92c88d 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -832,7 +832,7 @@ struct ieee802_11_elems {
         u8 *fh_params;
         u8 *ds_params;
         u8 *cf_params;
-        u8 *tim;
+        struct ieee80211_tim_ie *tim;
         u8 *ibss_params;
         u8 *challenge;
         u8 *wpa;