netdev - [PATCH net-next 05/17] tipc: Add check to prevent insertion of duplicate name table entries

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Message-Id: <1330557523-2024-6-git-send-email-paul.gortmaker@windriver.com>
Date:	Wed, 29 Feb 2012 18:18:31 -0500
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	davem@...emloft.net
Cc:	netdev@...r.kernel.org, allan.stephens@...driver.com,
	ying.xue@...driver.com,
	Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: [PATCH net-next 05/17] tipc: Add check to prevent insertion of duplicate name table entries

From: Allan Stephens <allan.stephens@...driver.com>

Adds a new check to TIPC's name table logic to reject any attempt to
create a new name publication that is identical to an existing one.
(Such an attempt will never happen under normal circumstances, but
could arise if another network node malfunctions and issues a duplicate
name publication message.)

Signed-off-by: Allan Stephens <allan.stephens@...driver.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
---
 net/tipc/name_table.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/net/tipc/name_table.c b/net/tipc/name_table.c
index 1196f05..c2224f9 100644
--- a/net/tipc/name_table.c
+++ b/net/tipc/name_table.c
@@ -268,6 +268,13 @@ static struct publication *tipc_nameseq_insert_publ(struct name_seq *nseq,
 		}
 
 		info = sseq->info;
+
+		/* Check if an identical publication already exists */
+		list_for_each_entry(publ, &info->zone_list, zone_list) {
+			if ((publ->ref == port) && (publ->key == key) &&
+			    (!publ->node || (publ->node == node)))
+				return NULL;
+		}
 	} else {
 		u32 inspos;
 		struct sub_seq *freesseq;
-- 
1.7.9.1

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