From bd566e7525b5986864e8d6eb5b67640abcd284a9 Mon Sep 17 00:00:00 2001 From: Joonwoo Park Date: Fri, 18 Jan 2008 03:44:48 -0800 Subject: [PATCH] [IPV4] fib_hash: fix duplicated route issue http://bugzilla.kernel.org/show_bug.cgi?id=9493 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 Signed-off-by: David S. Miller --- net/ipv4/fib_hash.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/net/ipv4/fib_hash.c b/net/ipv4/fib_hash.c index 527a6e0af5b..99071d79c5e 100644 --- a/net/ipv4/fib_hash.c +++ b/net/ipv4/fib_hash.c @@ -444,6 +444,9 @@ static int fn_hash_insert(struct fib_table *tb, struct fib_config *cfg) struct fib_info *fi_drop; u8 state; + if (fi->fib_treeref > 1) + goto out; + write_lock_bh(&fib_hash_lock); fi_drop = fa->fa_info; fa->fa_info = fi; -- 2.20.1