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Message-Id: <E1guHbp-0000Nx-GQ@gondobar> 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; }
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