tipc: Prevent display of name table types with no publications

This patch adds a check to prevent TIPC's name table display code
from listing a name type entry if it exists only to hold subscription
info, rather than published names.

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

1 files changed, 3 insertions, 0 deletions

diff --git a/net/tipc/name_table.c b/net/tipc/name_table.c
index 892373e498e4..4455f13cfaf6 100644
--- a/net/tipc/name_table.c
+++ b/net/tipc/name_table.c
@@ -905,6 +905,9 @@ static void nameseq_list(struct name_seq *seq, struct print_buf *buf, u32 depth,
         struct sub_seq *sseq;
         char typearea[11];
 
+        if (seq->first_free == 0)
+                return;
+
         sprintf(typearea, "%-10u", seq->type);
 
         if (depth == 1) {