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Date:	Wed, 16 Jan 2008 20:13:49 +0900
From:	Joonwoo Park <>
To:	David Miller <>
Cc:	Joonwoo Park <>,
	linux-netdev <>,
	Stephen Hemminger <>,
	Alexander Zubkov <>
Subject: [PATCH 2/2] [IPV4] fib_trie: fix duplicated route issue

The fib allows making identical routes with 'ip route replace'.
This patch makes the fib return -EEXIST if replacement would cause duplication.

Signed-off-by: Joonwoo Park <>
 net/ipv4/fib_trie.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index 8d8c291..1010b46 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -1214,6 +1214,9 @@ static int fn_trie_insert(struct fib_table *tb, struct fib_config *cfg)
 			struct fib_info *fi_drop;
 			u8 state;
+			if (fi->fib_treeref > 1)
+				goto out;
 			err = -ENOBUFS;
 			new_fa = kmem_cache_alloc(fn_alias_kmem, GFP_KERNEL);
 			if (new_fa == NULL)

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