Commit 561dac2d authored Sep 11, 2011 by Gao feng Committed by David S. Miller Sep 21, 2011

fib:fix BUG_ON in fib_nl_newrule when add new fib rule



add new fib rule can cause BUG_ON happen
the reproduce shell is
ip rule add pref 38
ip rule add pref 38
ip rule add to 192.168.3.0/24 goto 38
ip rule del pref 38
ip rule add to 192.168.3.0/24 goto 38
ip rule add pref 38

then the BUG_ON will happen
del BUG_ON and use (ctarget == NULL) identify whether this rule is unresolved

Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent b811ce91

net/core/fib_rules.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -384,8 +384,8 @@ static int fib_nl_newrule(struct sk_buff skb, struct nlmsghdr nlh, void *arg)
		*/
		list_for_each_entry(r, &ops->rules_list, list) {
		if (r->action == FR_ACT_GOTO &&
		r->target == rule->pref) {
		BUG_ON(rtnl_dereference(r->ctarget) != NULL);
		r->target == rule->pref &&
		rtnl_dereference(r->ctarget) == NULL) {
		rcu_assign_pointer(r->ctarget, rule);
		if (--ops->unresolved_rules == 0)
		break;