netdev - [net-next PATCH v2] net: sched: cls_u32: rcu can not be last node

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Message-ID: <20140917173108.3864.57490.stgit@nitbit.x32>
Date:	Wed, 17 Sep 2014 10:31:14 -0700
From:	John Fastabend <john.fastabend@...il.com>
To:	xiyou.wangcong@...il.com, davem@...emloft.net,
	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org, jhs@...atatu.com
Subject: [net-next PATCH v2] net: sched: cls_u32: rcu can not be last node

tc_u32_sel 'sel' in tc_u_knode expects to be the last element in the
structure and pads the structure with tc_u32_key fields for each key.

 kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL)

CC: Eric Dumazet <edumazet@...gle.com>
Signed-off-by: John Fastabend <john.r.fastabend@...el.com>
---
 net/sched/cls_u32.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
index eceeb04..8462132 100644
--- a/net/sched/cls_u32.c
+++ b/net/sched/cls_u32.c
@@ -64,8 +64,9 @@ struct tc_u_knode {
 	u32 __percpu		*pcpu_success;
 #endif
 	struct tcf_proto	*tp;
-	struct tc_u32_sel	sel;
 	struct rcu_head		rcu;
+	struct tc_u32_sel	sel;
+	/* tc_u32_keys allocated at end of structure */
 };
 
 struct tc_u_hnode {

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