linux-kernel - Re: [PATCH] net: tipc: fix possible refcount leak in tipc_sk

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Message-ID: <aee933e9-e07e-49df-94bf-a0ddea5da59e@gmail.com>
Date:   Wed, 29 Jun 2022 14:09:42 +0800
From:   Hangyu Hua <hbh25y@...il.com>
To:     Tung Quang Nguyen <tung.q.nguyen@...tech.com.au>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "tipc-discussion@...ts.sourceforge.net" 
        <tipc-discussion@...ts.sourceforge.net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "jmaloy@...hat.com" <jmaloy@...hat.com>,
        "ying.xue@...driver.com" <ying.xue@...driver.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "tgraf@...g.ch" <tgraf@...g.ch>
Subject: Re: [PATCH] net: tipc: fix possible refcount leak in tipc_sk_create()

On 2022/6/29 11:49, Tung Quang Nguyen wrote:
>> sk need to be free when tipc_sk_insert fails. While tipc_sk_insert is hard
>> to fail, it's better to fix this.
> Incorrect English grammar. You should use a simple comment in changelog, for example: "Free sk in case tipc_sk_insert() fails."

Thanks a lot. I will fix this then send a v2.

Hangyu.

>>
>> Fixes: 07f6c4bc048a ("tipc: convert tipc reference table to use generic rhashtable")
>> Signed-off-by: Hangyu Hua <hbh25y@...il.com>
>> ---
>>   net/tipc/socket.c | 1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/net/tipc/socket.c b/net/tipc/socket.c
>> index 17f8c523e33b..43509c7e90fc 100644
>> --- a/net/tipc/socket.c
>> +++ b/net/tipc/socket.c
>> @@ -502,6 +502,7 @@ static int tipc_sk_create(struct net *net, struct socket *sock,
>>   	sock_init_data(sock, sk);
>>   	tipc_set_sk_state(sk, TIPC_OPEN);
>>   	if (tipc_sk_insert(tsk)) {
>> +		sk_free(sk);
>>   		pr_warn("Socket create failed; port number exhausted\n");
>>   		return -EINVAL;
>>   	}
>> --
>> 2.25.1
>