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Merge branch 'net-packet-data-races'

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Eric Dumazet says:

====================
net/packet: annotate data races

KCSAN sent two reports about data races in af_packet.
Nothing serious, but worth fixing.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2021-06-16 12:48:18 -07:00
commit 1d2ac2033d
1 changed files with 17 additions and 15 deletions
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32
net/packet/af_packet.c
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@ -2683,7 +2683,7 @@ static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
}
if (likely(saddr == NULL)) {
dev = packet_cached_dev_get(po);
proto = po->num;
proto = READ_ONCE(po->num);
} else {
err = -EINVAL;
if (msg->msg_namelen < sizeof(struct sockaddr_ll))
@ -2896,7 +2896,7 @@ static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len)
if (likely(saddr == NULL)) {
dev = packet_cached_dev_get(po);
proto = po->num;
proto = READ_ONCE(po->num);
} else {
err = -EINVAL;
if (msg->msg_namelen < sizeof(struct sockaddr_ll))
@ -3171,7 +3171,7 @@ static int packet_do_bind(struct sock *sk, const char *name, int ifindex,
/* prevents packet_notifier() from calling
* register_prot_hook()
*/
po->num = 0;
WRITE_ONCE(po->num, 0);
__unregister_prot_hook(sk, true);
rcu_read_lock();
dev_curr = po->prot_hook.dev;
@ -3181,17 +3181,17 @@ static int packet_do_bind(struct sock *sk, const char *name, int ifindex,
}
BUG_ON(po->running);
po->num = proto;
WRITE_ONCE(po->num, proto);
po->prot_hook.type = proto;
if (unlikely(unlisted)) {
dev_put(dev);
po->prot_hook.dev = NULL;
po->ifindex = -1;
WRITE_ONCE(po->ifindex, -1);
packet_cached_dev_reset(po);
} else {
po->prot_hook.dev = dev;
po->ifindex = dev ? dev->ifindex : 0;
WRITE_ONCE(po->ifindex, dev ? dev->ifindex : 0);
packet_cached_dev_assign(po, dev);
}
}
@ -3505,7 +3505,7 @@ static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr,
uaddr->sa_family = AF_PACKET;
memset(uaddr->sa_data, 0, sizeof(uaddr->sa_data));
rcu_read_lock();
dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex);
dev = dev_get_by_index_rcu(sock_net(sk), READ_ONCE(pkt_sk(sk)->ifindex));
if (dev)
strlcpy(uaddr->sa_data, dev->name, sizeof(uaddr->sa_data));
rcu_read_unlock();
@ -3520,16 +3520,18 @@ static int packet_getname(struct socket *sock, struct sockaddr *uaddr,
struct sock *sk = sock->sk;
struct packet_sock *po = pkt_sk(sk);
DECLARE_SOCKADDR(struct sockaddr_ll *, sll, uaddr);
int ifindex;
if (peer)
return -EOPNOTSUPP;
ifindex = READ_ONCE(po->ifindex);
sll->sll_family = AF_PACKET;
sll->sll_ifindex = po->ifindex;
sll->sll_protocol = po->num;
sll->sll_ifindex = ifindex;
sll->sll_protocol = READ_ONCE(po->num);
sll->sll_pkttype = 0;
rcu_read_lock();
dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex);
dev = dev_get_by_index_rcu(sock_net(sk), ifindex);
if (dev) {
sll->sll_hatype = dev->type;
sll->sll_halen = dev->addr_len;
@ -4108,7 +4110,7 @@ static int packet_notifier(struct notifier_block *this,
}
if (msg == NETDEV_UNREGISTER) {
packet_cached_dev_reset(po);
po->ifindex = -1;
WRITE_ONCE(po->ifindex, -1);
if (po->prot_hook.dev)
dev_put(po->prot_hook.dev);
po->prot_hook.dev = NULL;
@ -4414,7 +4416,7 @@ static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
was_running = po->running;
num = po->num;
if (was_running) {
po->num = 0;
WRITE_ONCE(po->num, 0);
__unregister_prot_hook(sk, false);
}
spin_unlock(&po->bind_lock);
@ -4449,7 +4451,7 @@ static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
spin_lock(&po->bind_lock);
if (was_running) {
po->num = num;
WRITE_ONCE(po->num, num);
register_prot_hook(sk);
}
spin_unlock(&po->bind_lock);
@ -4619,8 +4621,8 @@ static int packet_seq_show(struct seq_file *seq, void *v)
s,
refcount_read(&s->sk_refcnt),
s->sk_type,
ntohs(po->num),
po->ifindex,
ntohs(READ_ONCE(po->num)),
READ_ONCE(po->ifindex),
po->running,
atomic_read(&s->sk_rmem_alloc),
from_kuid_munged(seq_user_ns(seq), sock_i_uid(s)),