Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
To:     Geliang Tang <geliangtang@gmail.com>,
        Mat Martineau <mathew.j.martineau@linux.intel.com>,
        "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>
Cc:     netdev@vger.kernel.org, mptcp@lists.01.org,
        linux-kernel@vger.kernel.org,
        Dan Carpenter <dan.carpenter@oracle.com>
References: <cover.1604930005.git.geliangtang@gmail.com>
 <ccf004469e02fb5bd7ec822414b9a98b0015f4a3.1604930005.git.geliangtang@gmail.com>
From:   Matthieu Baerts <matthieu.baerts@tessares.net>
Subject: Re: [MPTCP][PATCH net 1/2] mptcp: fix static checker warnings in
 mptcp_pm_add_timer
Message-ID: <009ea5da-8a44-3ea2-1b9f-a658a09f3396@tessares.net>
Date:   Mon, 9 Nov 2020 17:28:54 +0100
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101
 Thunderbird/78.4.0
MIME-Version: 1.0
In-Reply-To: <ccf004469e02fb5bd7ec822414b9a98b0015f4a3.1604930005.git.geliangtang@gmail.com>
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Language: en-GB
Content-Transfer-Encoding: 8bit
Precedence: bulk

Hi Geliang, Dan,

On 09/11/2020 14:59, Geliang Tang wrote:
> Fix the following Smatch complaint:

Thanks for the report and the patch!

>       net/mptcp/pm_netlink.c:213 mptcp_pm_add_timer()
>       warn: variable dereferenced before check 'msk' (see line 208)
> 
>   net/mptcp/pm_netlink.c
>      207          struct mptcp_sock *msk = entry->sock;
>      208          struct sock *sk = (struct sock *)msk;
>      209          struct net *net = sock_net(sk);
>                                             ^^
>   "msk" dereferenced here.
> 
>      210
>      211          pr_debug("msk=%p", msk);
>      212
>      213          if (!msk)
>                      ^^^^
>   Too late.
> 
>      214                  return;
>      215
> 
> Fixes: 93f323b9cccc ("mptcp: add a new sysctl add_addr_timeout")
> Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
> Signed-off-by: Geliang Tang <geliangtang@gmail.com>
> Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>

A small detail (I think): the Signed-off-by of the sender (Geliang) 
should be the last one in the list if I am not mistaken.
But I guess this is not blocking.

Reviewed-by: Matthieu Baerts <matthieu.baerts@tessares.net>

Cheers,
Matt
-- 
Tessares | Belgium | Hybrid Access Solutions
www.tessares.net