microsoft
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WSL2-Linux-Kernel
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Код Задачи Пакеты Проекты Релизы Вики Активность

af_packet: lock imbalance 

fanout_add() might return with fanout_mutex held.

Reduce indentation level while we are at it

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2011-07-07 06:41:29 -07:00 коммит произвёл David S. Miller
Родитель 68ac31918e
Коммит afe62c68cd
1 изменённых файлов: 32 добавлений и 32 удалений
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64
net/packet/af_packet.c
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@ -589,43 +589,43 @@ static int fanout_add(struct sock *sk, u16 id, u16 type_flags)
break;
}
}
err = -EINVAL;
if (match && match->defrag != defrag)
return -EINVAL;
goto out;
if (!match) {
err = -ENOMEM;
match = kzalloc(sizeof(*match), GFP_KERNEL);
if (match) {
write_pnet(&match->net, sock_net(sk));
match->id = id;
match->type = type;
match->defrag = defrag;
atomic_set(&match->rr_cur, 0);
INIT_LIST_HEAD(&match->list);
spin_lock_init(&match->lock);
atomic_set(&match->sk_ref, 0);
match->prot_hook.type = po->prot_hook.type;
match->prot_hook.dev = po->prot_hook.dev;
match->prot_hook.func = packet_rcv_fanout;
match->prot_hook.af_packet_priv = match;
dev_add_pack(&match->prot_hook);
list_add(&match->list, &fanout_list);
}
}
err = -ENOMEM;
if (match) {
err = -EINVAL;
if (match->type == type &&
match->prot_hook.type == po->prot_hook.type &&
match->prot_hook.dev == po->prot_hook.dev) {
err = -ENOSPC;
if (atomic_read(&match->sk_ref) < PACKET_FANOUT_MAX) {
__dev_remove_pack(&po->prot_hook);
po->fanout = match;
atomic_inc(&match->sk_ref);
__fanout_link(sk, po);
err = 0;
}
if (!match)
goto out;
write_pnet(&match->net, sock_net(sk));
match->id = id;
match->type = type;
match->defrag = defrag;
atomic_set(&match->rr_cur, 0);
INIT_LIST_HEAD(&match->list);
spin_lock_init(&match->lock);
atomic_set(&match->sk_ref, 0);
match->prot_hook.type = po->prot_hook.type;
match->prot_hook.dev = po->prot_hook.dev;
match->prot_hook.func = packet_rcv_fanout;
match->prot_hook.af_packet_priv = match;
dev_add_pack(&match->prot_hook);
list_add(&match->list, &fanout_list);
}
err = -EINVAL;
if (match->type == type &&
match->prot_hook.type == po->prot_hook.type &&
match->prot_hook.dev == po->prot_hook.dev) {
err = -ENOSPC;
if (atomic_read(&match->sk_ref) < PACKET_FANOUT_MAX) {
__dev_remove_pack(&po->prot_hook);
po->fanout = match;
atomic_inc(&match->sk_ref);
__fanout_link(sk, po);
err = 0;
}
}
out:
mutex_unlock(&fanout_mutex);
return err;
}