netdev - [PATCH net] mac80211: mesh: fix missing unlock on error in table_path

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Date:   Mon, 18 Feb 2019 11:29:29 +0100
From:   Johannes Berg <johannes@...solutions.net>
To:     linux-wireless@...r.kernel.org, netdev@...r.kernel.org
Cc:     Herbert Xu <herbert@...dor.apana.org.au>,
        Wei Yongjun <weiyongjun1@...wei.com>
Subject: [PATCH net] mac80211: mesh: fix missing unlock on error in table_path_del()

From: Wei Yongjun <weiyongjun1@...wei.com>

spin_lock_bh() is used in table_path_del() but rcu_read_unlock()
is used for unlocking. Fix it by using spin_unlock_bh() instead
of rcu_read_unlock() in the error handling case.

Fixes: b4c3fbe63601 ("mac80211: Use linked list instead of rhashtable walk for mesh tables")
Acked-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Wei Yongjun <weiyongjun1@...wei.com>
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
---
Dave, can you take this directly? I see little value in sending a
pull request for this one patch (but if you prefer can do so.)
---
 net/mac80211/mesh_pathtbl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/mac80211/mesh_pathtbl.c b/net/mac80211/mesh_pathtbl.c
index c3a7396fb955..88a6d5e18ccc 100644
--- a/net/mac80211/mesh_pathtbl.c
+++ b/net/mac80211/mesh_pathtbl.c
@@ -627,7 +627,7 @@ static int table_path_del(struct mesh_table *tbl,
 	spin_lock_bh(&tbl->walk_lock);
 	mpath = rhashtable_lookup_fast(&tbl->rhead, addr, mesh_rht_params);
 	if (!mpath) {
-		rcu_read_unlock();
+		spin_unlock_bh(&tbl->walk_lock);
 		return -ENXIO;
 	}
 
-- 
2.17.2