From 4ff3a9d14c6c06eaa4e5976c61599ea2bd9e81b2 Mon Sep 17 00:00:00 2001
From: Herbert Xu <herbert@gondor.apana.org.au>
Date: Thu, 14 Feb 2019 22:03:25 +0800
Subject: [PATCH] mac80211: Free mpath object when rhashtable insertion fails
Git-commit: 4ff3a9d14c6c06eaa4e5976c61599ea2bd9e81b2
Patch-mainline: v5.0-rc8
References: bsc#1051510

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

Cc: stable@vger.kernel.org
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Acked-by: Takashi Iwai <tiwai@suse.de>

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

--- a/net/mac80211/mesh_pathtbl.c
+++ b/net/mac80211/mesh_pathtbl.c
@@ -448,17 +448,15 @@ struct mesh_path *mesh_path_add(struct i
 
 	} while (unlikely(ret == -EEXIST && !mpath));
 
-	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;
 }
@@ -488,6 +486,9 @@ int mpp_path_add(struct ieee80211_sub_if
 					    &new_mpath->rhash,
 					    mesh_rht_params);
 
+	if (ret)
+		kfree(new_mpath);
+
 	sdata->u.mesh.mpp_paths_generation++;
 	return ret;
 }