nl80211: check nla_parse_nested() return values

At the very least we should check the return value if
nla_parse_nested() is called with a non-NULL policy.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/wireless/nl80211.c

@@ -10949,9 +10949,12 @@ static int nl80211_set_wowlan(struct sk_buff *skb, struct genl_info *info)
 				    rem) {
 			u8 *mask_pat;
 
-			nla_parse_nested(pat_tb, MAX_NL80211_PKTPAT, pat,
-					 nl80211_packet_pattern_policy,
-					 info->extack);
+			err = nla_parse_nested(pat_tb, MAX_NL80211_PKTPAT, pat,
+					       nl80211_packet_pattern_policy,
+					       info->extack);
+			if (err)
+				goto error;
+
 			err = -EINVAL;
 			if (!pat_tb[NL80211_PKTPAT_MASK] ||
 			    !pat_tb[NL80211_PKTPAT_PATTERN])
@@ -11200,8 +11203,11 @@ static int nl80211_parse_coalesce_rule(struct cfg80211_registered_device *rdev,
 			    rem) {
 		u8 *mask_pat;
 
-		nla_parse_nested(pat_tb, MAX_NL80211_PKTPAT, pat,
-				 nl80211_packet_pattern_policy, NULL);
+		err = nla_parse_nested(pat_tb, MAX_NL80211_PKTPAT, pat,
+				       nl80211_packet_pattern_policy, NULL);
+		if (err)
+			return err;
+
 		if (!pat_tb[NL80211_PKTPAT_MASK] ||
 		    !pat_tb[NL80211_PKTPAT_PATTERN])
 			return -EINVAL;