tipc: Convert fatal broadcast sanity check to non-fatal check

Modifies the existing broadcast link sanity check that detects an
attempt to send a message off-node when there are no available
destinations so that it no longer causes a kernel panic; instead,
the check now issues a warning and stack trace and then returns
without sending the message anywhere.

Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/net/tipc/bcast.c b/net/tipc/bcast.c
index fa68d1e9ff4b..759b318b5ffb 100644
--- a/net/tipc/bcast.c
+++ b/net/tipc/bcast.c
@@ -552,12 +552,16 @@ static int tipc_bcbearer_send(struct sk_buff *buf,
         if (likely(!msg_non_seq(buf_msg(buf)))) {
                 struct tipc_msg *msg;
 
-                assert(tipc_bcast_nmap.count != 0);
                 bcbuf_set_acks(buf, tipc_bcast_nmap.count);
                 msg = buf_msg(buf);
                 msg_set_non_seq(msg, 1);
                 msg_set_mc_netid(msg, tipc_net_id);
                 bcl->stats.sent_info++;
+
+                if (WARN_ON(!tipc_bcast_nmap.count)) {
+                        dump_stack();
+                        return 0;
+                }
         }
 
         /* Send buffer over bearers until all targets reached */