[IPV4]: Check fib4_rules_init failure.

This adds error paths into both versions of fib4_rules_init
(with/without CONFIG_IP_MULTIPLE_TABLES) and returns error code to the
caller.

Acked-by: Benjamin Thery <benjamin.thery@bull.net>
Acked-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Signed-off-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 12 insertions, 2 deletions

diff --git a/net/ipv4/fib_rules.c b/net/ipv4/fib_rules.c
index afe669dd1bd..0751734ecf4 100644
--- a/net/ipv4/fib_rules.c
+++ b/net/ipv4/fib_rules.c
@@ -311,8 +311,18 @@ static int __init fib_default_rules_init(void)
 	return 0;
 }
 
-void __init fib4_rules_init(void)
+int __init fib4_rules_init()
 {
-	BUG_ON(fib_default_rules_init());
+	int err;
+
 	fib_rules_register(&init_net, &fib4_rules_ops);
+	err = fib_default_rules_init();
+	if (err < 0)
+		goto fail;
+	return 0;
+
+fail:
+	/* also cleans all rules already added */
+	fib_rules_unregister(&init_net, &fib4_rules_ops);
+	return err;
 }