linux-kernel - Re: [PATCH net 1/2] sctp: remove redundant assignment when call sctp_get_port

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Date:   Wed, 11 Sep 2019 09:30:47 +0800
From:   maowenan <maowenan@...wei.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>
CC:     <vyasevich@...il.com>, <nhorman@...driver.com>,
        <marcelo.leitner@...il.com>, <davem@...emloft.net>,
        <linux-sctp@...r.kernel.org>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <kernel-janitors@...r.kernel.org>
Subject: Re: [PATCH net 1/2] sctp: remove redundant assignment when call
 sctp_get_port_local



On 2019/9/11 3:22, Dan Carpenter wrote:
> On Tue, Sep 10, 2019 at 09:57:10PM +0300, Dan Carpenter wrote:
>> On Tue, Sep 10, 2019 at 03:13:42PM +0800, Mao Wenan wrote:
>>> There are more parentheses in if clause when call sctp_get_port_local
>>> in sctp_do_bind, and redundant assignment to 'ret'. This patch is to
>>> do cleanup.
>>>
>>> Signed-off-by: Mao Wenan <maowenan@...wei.com>
>>> ---
>>>  net/sctp/socket.c | 3 +--
>>>  1 file changed, 1 insertion(+), 2 deletions(-)
>>>
>>> diff --git a/net/sctp/socket.c b/net/sctp/socket.c
>>> index 9d1f83b10c0a..766b68b55ebe 100644
>>> --- a/net/sctp/socket.c
>>> +++ b/net/sctp/socket.c
>>> @@ -399,9 +399,8 @@ static int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
>>>  	 * detection.
>>>  	 */
>>>  	addr->v4.sin_port = htons(snum);
>>> -	if ((ret = sctp_get_port_local(sk, addr))) {
>>> +	if (sctp_get_port_local(sk, addr))
>>>  		return -EADDRINUSE;
>>
>> sctp_get_port_local() returns a long which is either 0,1 or a pointer
>> casted to long.  It's not documented what it means and neither of the
>> callers use the return since commit 62208f12451f ("net: sctp: simplify
>> sctp_get_port").
> 
> Actually it was commit 4e54064e0a13 ("sctp: Allow only 1 listening
> socket with SO_REUSEADDR") from 11 years ago.  That patch fixed a bug,
> because before the code assumed that a pointer casted to an int was the
> same as a pointer casted to a long.

commit 4e54064e0a13 treated non-zero return value as unexpected, so the current
cleanup is ok?

> 
> regards,
> dan carpenter
> 
> 
> .
>