From: Eric Dumazet Date: Mon, 27 Sep 2010 06:07:30 +0000 (+0000) Subject: net: sk_{detach|attach}_filter() rcu fixes X-Git-Tag: v2.6.37-rc1~147^2~341 X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=f91ff5b9ff529be8aac2039af63b2c8ea6cd6ebe;p=~shefty%2Frdma-dev.git net: sk_{detach|attach}_filter() rcu fixes sk_attach_filter() and sk_detach_filter() are 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 Signed-off-by: David S. Miller --- diff --git a/net/core/filter.c b/net/core/filter.c index 52b051f82a0..7adf5035291 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); @@ -654,14 +653,13 @@ int sk_detach_filter(struct sock *sk) int ret = -ENOENT; struct sk_filter *filter; - rcu_read_lock_bh(); - filter = rcu_dereference_bh(sk->sk_filter); + filter = rcu_dereference_protected(sk->sk_filter, + sock_owned_by_user(sk)); if (filter) { rcu_assign_pointer(sk->sk_filter, NULL); sk_filter_delayed_uncharge(sk, filter); ret = 0; } - rcu_read_unlock_bh(); return ret; } EXPORT_SYMBOL_GPL(sk_detach_filter);