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

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Message-Id: <1371209403-28275-1-git-send-email-aydin.arik@alliedtelesis.co.nz>
Date:	Fri, 14 Jun 2013 23:30:03 +1200
From:	Aydin Arik <aydin.arik@...iedtelesis.co.nz>
To:	unlisted-recipients:; (no To-header on input)
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,
	Aydin Arik <aydin.arik@...iedtelesis.co.nz>
Subject: [PATCH 1/1] [PATCH v2] tcp: Fixed MD5 key lookups when adding/removing MD5.

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);
-- 
1.7.9.5

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