netdev - [PATCH net] vxlan: Do not reuse sockets for a different address family

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Message-Id: <b2c5c4c68f0ae715802b4b4fd35fd1031c65aac0.1415108561.git.mleitner@redhat.com>
Date:	Tue,  4 Nov 2014 11:46:49 -0200
From:	Marcelo Ricardo Leitner <mleitner@...hat.com>
To:	netdev@...r.kernel.org
Cc:	stephen@...workplumber.org
Subject: [PATCH net] vxlan: Do not reuse sockets for a different address family

Currently, we only match against local port number in order to reuse
socket. But if this new vxlan wants an IPv6 socket and a IPv4 one bound
to that port, vxlan will reuse an IPv4 socket as IPv6 and a panic will
follow. The following steps reproduce it:

   # ip link add vxlan6 type vxlan id 42 group 229.10.10.10 \
       srcport 5000 6000 dev eth0
   # ip link add vxlan7 type vxlan id 43 group ff0e::110 \
       srcport 5000 6000 dev eth0
   # ip link set vxlan6 up
   # ip link set vxlan7 up
   <panic>

[    4.187481] BUG: unable to handle kernel NULL pointer dereference at 0000000000000058
[    4.187509] IP: [<ffffffff81667c98>] ipv6_sock_mc_join+0x88/0x630
...
[    4.188076] Call Trace:
[    4.188085]  [<ffffffff81667c4a>] ? ipv6_sock_mc_join+0x3a/0x630
[    4.188098]  [<ffffffffa05a6ad6>] vxlan_igmp_join+0x66/0xd0 [vxlan]
[    4.188113]  [<ffffffff810a3430>] process_one_work+0x220/0x710
[    4.188125]  [<ffffffff810a33c4>] ? process_one_work+0x1b4/0x710
[    4.188138]  [<ffffffff810a3a3b>] worker_thread+0x11b/0x3a0
[    4.188149]  [<ffffffff810a3920>] ? process_one_work+0x710/0x710

So address family must also match in order to reuse a socket.

Reported-by: Jean-Tsung Hsiao <jhsiao@...hat.com>
Signed-off-by: Marcelo Ricardo Leitner <mleitner@...hat.com>
---
 drivers/net/vxlan.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index ca309820d39e1ba7995f38d3a2f9bacbd1c1f857..c0fa76d55ae3cc07fb14b70656d6b13b5bab091c 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -281,7 +281,8 @@ static struct vxlan_sock *vxlan_find_sock(struct net *net, __be16 port)
 	struct vxlan_sock *vs;
 
 	hlist_for_each_entry_rcu(vs, vs_head(net, port), hlist) {
-		if (inet_sk(vs->sock->sk)->inet_sport == port)
+		if ((inet_sk(vs->sock->sk)->inet_sport == port) &&
+			(inet_sk(vs->sock->sk)->sk.sk_family == family))
 			return vs;
 	}
 	return NULL;
-- 
1.9.3

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