netdev - [PATCH net-next-2.6] net: sk_attach

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Message-ID: <1285603064.3017.42.camel@edumazet-laptop>
Date:	Mon, 27 Sep 2010 17:57:44 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev <netdev@...r.kernel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [PATCH net-next-2.6] net: sk_attach_filter() rcu fix

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@...il.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);


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