netdev - [PATCH net] netdevsim: fix unbalaced locking in nsim

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Message-Id: <20200718064921.9280-1-ap420073@gmail.com>
Date:   Sat, 18 Jul 2020 06:49:21 +0000
From:   Taehee Yoo <ap420073@...il.com>
To:     davem@...emloft.net, kuba@...nel.org, netdev@...r.kernel.org
Cc:     jiri@...lanox.com, ap420073@...il.com
Subject: [PATCH net] netdevsim: fix unbalaced locking in nsim_create()

In the nsim_create(), rtnl_lock() is called before nsim_bpf_init().
If nsim_bpf_init() is failed, rtnl_unlock() should be called,
but it isn't called.
So, unbalanced locking would occur.

Fixes: e05b2d141fef ("netdevsim: move netdev creation/destruction to dev probe")
Signed-off-by: Taehee Yoo <ap420073@...il.com>
---
 drivers/net/netdevsim/netdev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/netdevsim/netdev.c b/drivers/net/netdevsim/netdev.c
index 2908e0a0d6e1..b2a67a88b6ee 100644
--- a/drivers/net/netdevsim/netdev.c
+++ b/drivers/net/netdevsim/netdev.c
@@ -316,8 +316,8 @@ nsim_create(struct nsim_dev *nsim_dev, struct nsim_dev_port *nsim_dev_port)
 err_ipsec_teardown:
 	nsim_ipsec_teardown(ns);
 	nsim_bpf_uninit(ns);
-	rtnl_unlock();
 err_free_netdev:
+	rtnl_unlock();
 	free_netdev(dev);
 	return ERR_PTR(err);
 }
-- 
2.17.1