From 614bdd4d6e61d260d82945f5f52a5dc288f64783 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Tue, 3 May 2016 17:10:50 -0700 Subject: tcp: must block bh in __inet_twsk_hashdance() __inet_twsk_hashdance() might be called from process context, better block BH before acquiring bind hash and established locks Fixes: c10d9310edf5 ("tcp: do not assume TCP code is non preemptible") Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller --- net/ipv4/inet_timewait_sock.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'net/ipv4') diff --git a/net/ipv4/inet_timewait_sock.c b/net/ipv4/inet_timewait_sock.c index 99ee5c4a9b68..206581674806 100644 --- a/net/ipv4/inet_timewait_sock.c +++ b/net/ipv4/inet_timewait_sock.c @@ -94,7 +94,7 @@ static void inet_twsk_add_bind_node(struct inet_timewait_sock *tw, } /* - * Enter the time wait state. This is called with locally disabled BH. + * Enter the time wait state. * Essentially we whip up a timewait bucket, copy the relevant info into it * from the SK, and mess with hash chains and list linkage. */ @@ -112,7 +112,7 @@ void __inet_twsk_hashdance(struct inet_timewait_sock *tw, struct sock *sk, */ bhead = &hashinfo->bhash[inet_bhashfn(twsk_net(tw), inet->inet_num, hashinfo->bhash_size)]; - spin_lock(&bhead->lock); + spin_lock_bh(&bhead->lock); tw->tw_tb = icsk->icsk_bind_hash; WARN_ON(!icsk->icsk_bind_hash); inet_twsk_add_bind_node(tw, &tw->tw_tb->owners); @@ -138,7 +138,7 @@ void __inet_twsk_hashdance(struct inet_timewait_sock *tw, struct sock *sk, if (__sk_nulls_del_node_init_rcu(sk)) sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); - spin_unlock(lock); + spin_unlock_bh(lock); } EXPORT_SYMBOL_GPL(__inet_twsk_hashdance); -- cgit v1.2.3