diff options
| author | David Howells <dhowells@redhat.com> | 2016-09-29 22:37:15 +0100 |
|---|---|---|
| committer | David Howells <dhowells@redhat.com> | 2016-09-29 22:57:47 +0100 |
| commit | 1e9e5c9521d3667664a6e3c97075f71afec23720 (patch) | |
| tree | fb2447d0038b67d5ee980ab075047db2311ee308 /net/rxrpc/call_accept.c | |
| parent | 2629c7fa7c0adfdf023051b404cd538951bd0354 (diff) | |
rxrpc: Reduce the rxrpc_local::services list to a pointer
Reduce the rxrpc_local::services list to just a pointer as we don't permit
multiple service endpoints to bind to a single transport endpoints (this is
excluded by rxrpc_lookup_local()).
The reason we don't allow this is that if you send a request to an AFS
filesystem service, it will try to talk back to your cache manager on the
port you sent from (this is how file change notifications are handled). To
prevent someone from stealing your CM callbacks, we don't let AF_RXRPC
sockets share a UDP socket if at least one of them has a service bound.
Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'net/rxrpc/call_accept.c')
| -rw-r--r-- | net/rxrpc/call_accept.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/net/rxrpc/call_accept.c b/net/rxrpc/call_accept.c index a8d39d7cf42c..3cac231d8405 100644 --- a/net/rxrpc/call_accept.c +++ b/net/rxrpc/call_accept.c @@ -331,14 +331,14 @@ struct rxrpc_call *rxrpc_new_incoming_call(struct rxrpc_local *local, struct rxrpc_skb_priv *sp = rxrpc_skb(skb); struct rxrpc_sock *rx; struct rxrpc_call *call; + u16 service_id = sp->hdr.serviceId; _enter(""); /* Get the socket providing the service */ - hlist_for_each_entry_rcu_bh(rx, &local->services, listen_link) { - if (rx->srx.srx_service == sp->hdr.serviceId) - goto found_service; - } + rx = rcu_dereference(local->service); + if (service_id == rx->srx.srx_service) + goto found_service; trace_rxrpc_abort("INV", sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq, RX_INVALID_OPERATION, EOPNOTSUPP); |