[PATCHv2 net-next 1/5] sctp: only copy the available addr data in sctp_transport_init

[Xin Long]

'addr' passed to sctp_transport_init is not always a whole size
of union sctp_addr, like the path:

  sctp_sendmsg() ->
  sctp_sendmsg_new_asoc() ->
  sctp_assoc_add_peer() ->
  sctp_transport_new() -> sctp_transport_init()

In the next patches, we will also pass the address length of data
only to sctp_assoc_add_peer().

So sctp_transport_init() should copy the only available data from
addr to peer->ipaddr, instead of 'peer->ipaddr = *addr' which may
cause slab-out-of-bounds.

Signed-off-by: Xin Long <lucien....@gmail.com>
---
 net/sctp/transport.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/sctp/transport.c b/net/sctp/transport.c
index e2f8e36..7235a60 100644
--- a/net/sctp/transport.c
+++ b/net/sctp/transport.c
@@ -43,8 +43,8 @@ static struct sctp_transport *sctp_transport_init(struct net 
*net,
                                                  gfp_t gfp)
 {
        /* Copy in the address.  */
-       peer->ipaddr = *addr;
        peer->af_specific = sctp_get_af_specific(addr->sa.sa_family);
+       memcpy(&peer->ipaddr, addr, peer->af_specific->sockaddr_len);
        memset(&peer->saddr, 0, sizeof(union sctp_addr));
 
        peer->sack_generation = 0;
-- 
2.1.0