From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wanlong Gao Subject: [PATCH resend] fib:fix BUG_ON in fib_nl_newrule when add new fib rule Date: Mon, 12 Sep 2011 09:36:05 +0800 Message-ID: <1315791365-5324-1-git-send-email-wanlong.gao@gmail.com> References: <1315675150-3012-1-git-send-email-wanlong.gao@gmail.com> Cc: davem@davemloft.net, Gao feng , Gao feng , Eric Dumazet To: linux-kernel@vger.kernel.org, netdev@vger.kernel.org Return-path: In-Reply-To: <1315675150-3012-1-git-send-email-wanlong.gao@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org From: Gao feng 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 Signed-off-by: Eric Dumazet --- net/core/fib_rules.c | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-) diff --git a/net/core/fib_rules.c b/net/core/fib_rules.c index e7ab0c0..3231b46 100644 --- a/net/core/fib_rules.c +++ b/net/core/fib_rules.c @@ -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; -- 1.7.6