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[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 <joonwpark81@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Joonwoo Park 2008-01-18 03:44:48 -08:00 committed by David S. Miller
parent b3652b2dc5
commit bd566e7525
1 changed files with 3 additions and 0 deletions
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3
net/ipv4/fib_hash.c
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@ -444,6 +444,9 @@ static int fn_hash_insert(struct fib_table *tb, struct fib_config *cfg)
struct fib_info *fi_drop; struct fib_info *fi_drop;
u8 state; u8 state;
if (fi->fib_treeref > 1)
goto out;
write_lock_bh(&fib_hash_lock); write_lock_bh(&fib_hash_lock);
fi_drop = fa->fa_info; fi_drop = fa->fa_info;
fa->fa_info = fi; fa->fa_info = fi;