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| author | WANG Cong <xiyou.wangcong@gmail.com> | 2015-03-09 17:03:40 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-03-09 23:44:31 -0400 |
| commit | 5778d39d070b4ac5f889928175b7f2d53ae7504e (patch) | |
| tree | e2d972ae0d8199cd874e80fcaba18f2ecc533778 | |
| parent | affb8172de395a6e1db52ed9790ca0456d8c29a9 (diff) | |
| download | linux-5778d39d070b4ac5f889928175b7f2d53ae7504e.tar.bz2 | |
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: 1ce87720d456 ("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>
| -rw-r--r-- | net/sched/cls_u32.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c index 09487afbfd51..95fdf4e40051 100644 --- a/net/sched/cls_u32.c +++ b/net/sched/cls_u32.c @@ -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 { |