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net_sched: fix struct tc_u_hnode layout in u32 

We dynamically allocate divisor+1 entries for ->ht[] in tc_u_hnode:

  ht = kzalloc(sizeof(*ht) + divisor*sizeof(void *), GFP_KERNEL);

So ->ht is supposed to be the last field of this struct, however
this is broken, since an rcu head is appended after it.

Fixes: 1ce87720d4 ("net: sched: make cls_u32 lockless")
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Cc: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
WANG Cong 2015-03-09 17:03:40 -07:00 committed by David S. Miller
parent affb8172de
commit 5778d39d07
1 changed files with 4 additions and 1 deletions
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5
net/sched/cls_u32.c
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@ -78,8 +78,11 @@ struct tc_u_hnode {
struct tc_u_common *tp_c;
int refcnt;
unsigned int divisor;
struct tc_u_knode __rcu *ht[1];
struct rcu_head rcu;
/* The 'ht' field MUST be the last field in structure to allow for
* more entries allocated at end of structure.
*/
struct tc_u_knode __rcu *ht[1];
};
struct tc_u_common {