mac80211: check size of channel switch IE when parsing
The channel switch IE has a fixed size, so we can
discard it in parsing if it's not the right size
and use the right struct pointer.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 9e61fe1..b9cb8db 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -2267,14 +2267,10 @@
mutex_unlock(&local->iflist_mtx);
}
- if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
- (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
- ETH_ALEN) == 0)) {
- struct ieee80211_channel_sw_ie *sw_elem =
- (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
- ieee80211_sta_process_chanswitch(sdata, sw_elem,
+ if (elems->ch_switch_ie &&
+ memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid, ETH_ALEN) == 0)
+ ieee80211_sta_process_chanswitch(sdata, elems->ch_switch_ie,
bss, rx_status->mactime);
- }
}