tipc: Prevent crash when broadcast link cannot send to all nodes

Allow TIPC's broadcast link to continue operation when it is unable
to send a message to all nodes in the cluster.  Previously, the
broadcast link attempted to put the broadcast pseudo-bearer into a
blocked state; however, this caused a crash because the associated
bearer structure is only partially initialized.  Further
investigation has revealed some conceptual problems with blocking
the pseudo-bearer; consequently, this functionality has been
disabled for the time being and the undelivered message is
eventually resent by the broadcast link's existing message
retransmission mechanism (if possible).

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

1 files changed, 6 insertions, 4 deletions

diff --git a/net/tipc/bcast.c b/net/tipc/bcast.c
index a008c6689305..42b1737f0dcf 100644
--- a/net/tipc/bcast.c
+++ b/net/tipc/bcast.c
@@ -609,11 +609,13 @@ static int tipc_bcbearer_send(struct sk_buff *buf,
                 bcbearer->remains = bcbearer->remains_new;
         }
 
-        /* Unable to reach all targets */
+        /*
+         * Unable to reach all targets (indicate success, since currently
+         * there isn't code in place to properly block & unblock the
+         * pseudo-bearer used by the broadcast link)
+         */
 
-        bcbearer->bearer.publ.blocked = 1;
-        bcl->stats.bearer_congs++;
-        return 1;
+        return TIPC_OK;
 }
 
 /**