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

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Date:   Mon, 20 Jul 2020 10:57:21 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Taehee Yoo <ap420073@...il.com>
Cc:     davem@...emloft.net, netdev@...r.kernel.org, jiri@...lanox.com
Subject: Re: [PATCH net] netdevsim: fix unbalaced locking in nsim_create()

On Sat, 18 Jul 2020 06:49:21 +0000 Taehee Yoo wrote:
> 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:

Could you rename this label err_unlock, since it's not pointing to
free_netdev any more?

> +	rtnl_unlock();
>  	free_netdev(dev);
>  	return ERR_PTR(err);
>  }