nl80211: Validate MFP flag type when parsing STA flags

NL80211_STA_FLAG_MFP was forgotten from sta_flags_policy. The previous
version added the flag due to the loop used in parse_station_flags,
but the proper behavior would be to allow nla_parse_nested() to go
through the policy for all flags.

Signed-off-by: Jouni Malinen <jouni.malinen@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/wireless/nl80211.c

@@ -1331,6 +1331,7 @@ static const struct nla_policy sta_flags_policy[NL80211_STA_FLAG_MAX + 1] = {
 	[NL80211_STA_FLAG_AUTHORIZED] = { .type = NLA_FLAG },
 	[NL80211_STA_FLAG_SHORT_PREAMBLE] = { .type = NLA_FLAG },
 	[NL80211_STA_FLAG_WME] = { .type = NLA_FLAG },
+	[NL80211_STA_FLAG_MFP] = { .type = NLA_FLAG },
 };
 
 static int parse_station_flags(struct nlattr *nla, u32 *staflags)