From: Eric Dumazet <eric.dumazet@gmail.com>
To: David Miller <davem@davemloft.net>
Cc: netdev <netdev@vger.kernel.org>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Subject: [PATCH net-next-2.6] net: sk_attach_filter() rcu fix
Date: Mon, 27 Sep 2010 17:57:44 +0200 [thread overview]
Message-ID: <1285603064.3017.42.camel@edumazet-laptop> (raw)
sk_attach_filter() is run with socket locked.
Use the appropriate rcu_dereference_protected() instead of blocking BH,
and rcu_dereference_bh().
There is no point adding BH prevention and memory barrier.
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
---
net/core/filter.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/net/core/filter.c b/net/core/filter.c
index 52b051f..93ac5d2 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -638,10 +638,9 @@ int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk)
return err;
}
- rcu_read_lock_bh();
- old_fp = rcu_dereference_bh(sk->sk_filter);
+ old_fp = rcu_dereference_protected(sk->sk_filter,
+ sock_owned_by_user(sk));
rcu_assign_pointer(sk->sk_filter, fp);
- rcu_read_unlock_bh();
if (old_fp)
sk_filter_delayed_uncharge(sk, old_fp);
next reply other threads:[~2010-09-27 15:57 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-27 15:57 Eric Dumazet [this message]
2010-09-27 16:07 ` [PATCH net-next-2.6 v2] net: sk_{detach|attach}_filter() rcu fixes Eric Dumazet
2010-09-28 4:51 ` David Miller
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