Subject: Re: [PATCH 2/2] ipv6: use sk_v6_copy_addrs when memcpy struct ipv6_pinfo

From: wangweidong <[email-masked]>
Date: Tue, 19 Nov 2013 11:32:45 +0800

On 2013/11/19 11:14, Hannes Frederic Sowa wrote:
> On Tue, Nov 19, 2013 at 10:47:27AM +0800, Wang Weidong wrote:
>> diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
>> index 0740f93..83d011e 100644
>> --- a/net/ipv6/tcp_ipv6.c
>> +++ b/net/ipv6/tcp_ipv6.c
>> @@ -1116,6 +1116,10 @@ static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
>>  		newtp = tcp_sk(newsk);
>>  
>>  		memcpy(newnp, np, sizeof(struct ipv6_pinfo));
>> +		/* Don't forget copy the rcv_saddr and daddr when
>> +		 * copy ipv6_pinfo.
>> +		 */
>> +		sk_v6_copy_addrs(newsk, sk);
>>  
>>  		ipv6_addr_set_v4mapped(newinet->inet_daddr, &newsk->sk_v6_daddr);
>>  
> 
> Hmm, how did you spot this?
> 
> Greetings,
> 
>   Hannes
> 

When I did the lksctp-tools(1.0.15)/src/func_tests/test_getname_v6, I got a Segmentation fault.
So I try to resolve it. I found the sctp_accept will call sctp_v6_create_accept_sk in IPV6,
the function will memcpy the ipv6_pinfo, and not copy the sk_v6_rcv_saddr. But the getsockname
will read the sk_v6_rcv_saddr, and the value is not true.

> .