netdev - Re: [PATCH] Fix pppol2tp getsockname()

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Date:	Tue, 20 Mar 2012 12:21:05 +0000
From:	James Chapman <jchapman@...alix.com>
To:	Benjamin LaHaise <bcrl@...ck.org>
CC:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH] Fix pppol2tp getsockname()

On 20/03/12 11:49, James Chapman wrote:
> On 19/03/12 03:15, Benjamin LaHaise wrote:
>>
>> While testing L2TP functionality, I came across a bug in getsockname().  The
>> IP address returned within the pppol2tp_addr's addr memember was not being
>> set to the IP address in use.  This bug is caused by using inet_sk() on the
>> wrong socket (the L2TP socket rather than the underlying UDP socket), and was
>> likely introduced during the addition of L2TPv3 support.
>> ---
>>  net/l2tp/l2tp_ppp.c |    2 +-
>>  1 files changed, 1 insertions(+), 1 deletions(-)
>>
>> diff --git a/net/l2tp/l2tp_ppp.c b/net/l2tp/l2tp_ppp.c
>> index 96bc7a6..9b07191 100644
>> --- a/net/l2tp/l2tp_ppp.c
>> +++ b/net/l2tp/l2tp_ppp.c
>> @@ -915,7 +915,7 @@ static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr,
>>  		goto end_put_sess;
>>  	}
>>  
>> -	inet = inet_sk(sk);
>> +	inet = inet_sk(tunnel->sock);
>>  	if (tunnel->version == 2) {
>>  		struct sockaddr_pppol2tp sp;
>>  		len = sizeof(sp);
> 
> The patch is incorrect.
> 
> This is supposed to return the socket info of the pppol2tp socket, not
> the tunnel socket. It is used by pppd's pppol2tp plugin to check that
> the fd supplied is the right socket type.

Sorry, my mistake. This patch is fine.
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