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>

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 351eeaf..4eece06 100644 (file)
--- a/net/wireless/nl80211.c
+++ b/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;