tipc: fix bug in bundled buffer reception

In commit ec8a2e5621db2da24badb3969eda7fd359e1869f ("tipc: same receive
code path for connection protocol and data messages") we omitted the
the possiblilty that an arriving message extracted from a bundle buffer
may be a multicast message. Such messages need to be to be delivered to
the socket via a separate function, tipc_sk_mcast_rcv(). As a result,
small multicast messages arriving as members of a bundle buffer will be
silently dropped.

This commit corrects the error by considering this case in the function
tipc_link_bundle_rcv().

Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 1 deletions

diff --git a/net/tipc/link.c b/net/tipc/link.c
index 65410e18b8a6..1db162aa64a5 100644
--- a/net/tipc/link.c
+++ b/net/tipc/link.c
@@ -1924,7 +1924,12 @@ void tipc_link_bundle_rcv(struct sk_buff *buf)
                 }
                 omsg = buf_msg(obuf);
                 pos += align(msg_size(omsg));
-                if (msg_isdata(omsg) || (msg_user(omsg) == CONN_MANAGER)) {
+                if (msg_isdata(omsg)) {
+                        if (unlikely(msg_type(omsg) == TIPC_MCAST_MSG))
+                                tipc_sk_mcast_rcv(obuf);
+                        else
+                                tipc_sk_rcv(obuf);
+                } else if (msg_user(omsg) == CONN_MANAGER) {
                         tipc_sk_rcv(obuf);
                 } else if (msg_user(omsg) == NAME_DISTRIBUTOR) {
                         tipc_named_rcv(obuf);