[TIPC]: Force linearization of non-linear sk_buffs

This patch allows TIPC to process incoming messages that are
stored in a fragmented sk_buff, by forcing the linearization
of any such messages it receives.

Note: This is an interim solution to allow TIPC to operate with
Ethernet devices that generate non-linear buffers (such as the
gianfar driver), until such time as the rest of TIPC is enhanced
to handle sk_buffs with multiple data areas.

Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 0 deletions

diff --git a/net/tipc/link.c b/net/tipc/link.c
index a42f43430101..087379366d3c 100644
--- a/net/tipc/link.c
+++ b/net/tipc/link.c
@@ -1811,6 +1811,12 @@ void tipc_recv_msg(struct sk_buff *head, struct tipc_bearer *tb_ptr)
 #endif
                         msg_dbg(msg,"<REC<");
 
+                /* Ensure message data is a single contiguous unit */
+
+                if (unlikely(buf_linearize(buf))) {
+                        goto cont;
+                }
+
                 if (unlikely(msg_non_seq(msg))) {
                         link_recv_non_seq(buf);
                         continue;