1 files changed, 7 insertions, 2 deletions

diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c
index 80f5dd23417d..fd10981ea792 100644
--- a/net/sunrpc/rpc_pipe.c
+++ b/net/sunrpc/rpc_pipe.c
@@ -1093,7 +1093,7 @@ void rpc_put_sb_net(const struct net *net)
 {
         struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
 
-        BUG_ON(sn->pipefs_sb == NULL);
+        WARN_ON(sn->pipefs_sb == NULL);
         mutex_unlock(&sn->pipefs_sb_lock);
 }
 EXPORT_SYMBOL_GPL(rpc_put_sb_net);
@@ -1152,14 +1152,19 @@ static void rpc_kill_sb(struct super_block *sb)
         struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
 
         mutex_lock(&sn->pipefs_sb_lock);
+        if (sn->pipefs_sb != sb) {
+                mutex_unlock(&sn->pipefs_sb_lock);
+                goto out;
+        }
         sn->pipefs_sb = NULL;
         mutex_unlock(&sn->pipefs_sb_lock);
-        put_net(net);
         dprintk("RPC:       sending pipefs UMOUNT notification for net %p%s\n",
                 net, NET_NAME(net));
         blocking_notifier_call_chain(&rpc_pipefs_notifier_list,
                                            RPC_PIPEFS_UMOUNT,
                                            sb);
+        put_net(net);
+out:
         kill_litter_super(sb);
 }