linux-kernel - Re: [PATCH 1/1] [PATCH v2] tcp: Fixed MD5 key lookups when adding/removing MD5.

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Message-ID: <1371214687.3252.130.camel@edumazet-glaptop>
Date:	Fri, 14 Jun 2013 05:58:07 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Aydin Arik <aydin.arik@...iedtelesis.co.nz>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] [PATCH v2] tcp: Fixed MD5 key lookups when
 adding/removing MD5.

On Fri, 2013-06-14 at 23:30 +1200, Aydin Arik wrote:
> MD5 key lookups on a given TCP socket were being performed
> incorrectly. This fix alters parameter inputs to the MD5
> lookup function tcp_md5_do_lookup, which is called by functions
> tcp_md5_do_add and tcp_md5_do_del. Specifically, the change now
> inputs the correct address and address family required to make
> a proper lookup.
> 
> Commit a915da9b69273815527ccb3789421cb7027b545b ("tcp: md5: rcu conversion")
> is the source of the regression.
> 
> Signed-off-by: Aydin Arik <aydin.arik@...iedtelesis.co.nz>
> ---
>  net/ipv4/tcp_ipv4.c |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
> index d09203c..da84cdb 100644
> --- a/net/ipv4/tcp_ipv4.c
> +++ b/net/ipv4/tcp_ipv4.c
> @@ -1005,7 +1005,7 @@ int tcp_md5_do_add(struct sock *sk, const union tcp_md5_addr *addr,
>  	struct tcp_sock *tp = tcp_sk(sk);
>  	struct tcp_md5sig_info *md5sig;
>  
> -	key = tcp_md5_do_lookup(sk, (union tcp_md5_addr *)&addr, AF_INET);
> +	key = tcp_md5_do_lookup(sk, addr, family);
>  	if (key) {
>  		/* Pre-existing entry - just update that one. */
>  		memcpy(key->key, newkey, newkeylen);
> @@ -1050,7 +1050,7 @@ int tcp_md5_do_del(struct sock *sk, const union tcp_md5_addr *addr, int family)
>  	struct tcp_md5sig_key *key;
>  	struct tcp_md5sig_info *md5sig;
>  
> -	key = tcp_md5_do_lookup(sk, (union tcp_md5_addr *)&addr, AF_INET);
> +	key = tcp_md5_do_lookup(sk, addr, family);
>  	if (!key)
>  		return -ENOENT;
>  	hlist_del_rcu(&key->node);

Thanks !

Acked-by: Eric Dumazet <edumazet@...gle.com>

(No need for "[PATCH 1/1] " for a single patch)



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