nl80211: fix potential leak in AP start

If nl80211_parse_he_obss_pd() fails, we leak the previously
allocated ACL memory. Free it in this case.

Fixes: 796e90f42b7e ("cfg80211: add support for parsing OBBS_PD attributes")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Link: https://lore.kernel.org/r/20200221104142.835aba4cdd14.I1923b55ba9989c57e13978f91f40bfdc45e60cbd@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index cedf17d..46be40e 100644 (file)
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -4800,8 +4800,7 @@ static int nl80211_start_ap(struct sk_buff *skb, struct genl_info *info)
                err = nl80211_parse_he_obss_pd(
                                        info->attrs[NL80211_ATTR_HE_OBSS_PD],
                                        &params.he_obss_pd);
-               if (err)
-                       return err;
+               goto out;
        }
 
        nl80211_calculate_ap_params(&params);
@@ -4823,6 +4822,7 @@ static int nl80211_start_ap(struct sk_buff *skb, struct genl_info *info)
        }
        wdev_unlock(wdev);
 
+out:
        kfree(params.acl);
 
        return err;