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tipc: compare remote and local protocols in tipc_udp_enable()

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When TIPC_NLA_UDP_REMOTE is an IPv6 mcast address but
TIPC_NLA_UDP_LOCAL is an IPv4 address, a NULL-ptr deref is triggered
as the UDP tunnel sock is initialized to IPv4 or IPv6 sock merely
based on the protocol in local address.

We should just error out when the remote address and local address
have different protocols.

Reported-by: syzbot+eb4da3a20fad2e52555d@syzkaller.appspotmail.com
Cc: Ying Xue <ying.xue@windriver.com>
Cc: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Cong Wang 2018-12-10 15:23:30 -08:00 committed by David S. Miller
parent acb4a33e98
commit fb83ed496b
1 changed files with 5 additions and 0 deletions
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5
net/tipc/udp_media.c
View File

@ -679,6 +679,11 @@ static int tipc_udp_enable(struct net *net, struct tipc_bearer *b,
if (err)
goto err;
if (remote.proto != local.proto) {
err = -EINVAL;
goto err;
}
/* Checking remote ip address */
rmcast = tipc_udp_is_mcast_addr(&remote);