netdev - [PATCH 2/4] mac80211: Free mpath object when rhashtable insertion fails

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Date:   Thu, 14 Feb 2019 22:03:25 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     David Miller <davem@...emloft.net>, johannes@...solutions.net,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org, j@...fi,
        tgraf@...g.ch, johannes.berg@...el.com,
        Julia Lawall <julia.lawall@...6.fr>
Subject: [PATCH 2/4] mac80211: Free mpath object when rhashtable insertion fails

When rhashtable insertion fails the mesh table code doesn't free
the now-orphan mesh path object.  This patch fixes that.

Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
---

 net/mac80211/mesh_pathtbl.c |   17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/net/mac80211/mesh_pathtbl.c b/net/mac80211/mesh_pathtbl.c
index 884a0d212e8b..c3a7396fb955 100644
--- a/net/mac80211/mesh_pathtbl.c
+++ b/net/mac80211/mesh_pathtbl.c
@@ -436,17 +436,15 @@ struct mesh_path *mesh_path_add(struct ieee80211_sub_if_data *sdata,
 	} while (unlikely(ret == -EEXIST && !mpath));
 	spin_unlock_bh(&tbl->walk_lock);
 
-	if (ret && ret != -EEXIST)
-		return ERR_PTR(ret);
-
-	/* At this point either new_mpath was added, or we found a
-	 * matching entry already in the table; in the latter case
-	 * free the unnecessary new entry.
-	 */
-	if (ret == -EEXIST) {
+	if (ret) {
 		kfree(new_mpath);
+
+		if (ret != -EEXIST)
+			return ERR_PTR(ret);
+
 		new_mpath = mpath;
 	}
+
 	sdata->u.mesh.mesh_paths_generation++;
 	return new_mpath;
 }
@@ -481,6 +479,9 @@ int mpp_path_add(struct ieee80211_sub_if_data *sdata,
 		hlist_add_head_rcu(&new_mpath->walk_list, &tbl->walk_head);
 	spin_unlock_bh(&tbl->walk_lock);
 
+	if (ret)
+		kfree(new_mpath);
+
 	sdata->u.mesh.mpp_paths_generation++;
 	return ret;
 }