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authorDavid S. Miller <davem@davemloft.net>2017-02-16 19:34:01 -0500
committerDavid S. Miller <davem@davemloft.net>2017-02-16 19:34:01 -0500
commit3f64116a838e6c3468f9d5eed7f1f87cf3a2c3eb (patch)
tree388024d2ddbdcb9991ef4b472dfac31e425b807e /net/packet/af_packet.c
parentf3caf8618bce7e86c6f4f86785dd004c71b63a2d (diff)
parent4695daefba8df8a11fa0b0edd595eedae9ea59ae (diff)
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Diffstat (limited to 'net/packet/af_packet.c')
-rw-r--r--net/packet/af_packet.c55
1 files changed, 30 insertions, 25 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index a984f6f9ab4e..7098e2a457e4 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -1627,6 +1627,7 @@ static void fanout_release_data(struct packet_fanout *f)
static int fanout_add(struct sock *sk, u16 id, u16 type_flags)
{
+ struct packet_rollover *rollover = NULL;
struct packet_sock *po = pkt_sk(sk);
struct packet_fanout *f, *match;
u8 type = type_flags & 0xff;
@@ -1649,23 +1650,28 @@ static int fanout_add(struct sock *sk, u16 id, u16 type_flags)
return -EINVAL;
}
+ mutex_lock(&fanout_mutex);
+
+ err = -EINVAL;
if (!po->running)
- return -EINVAL;
+ goto out;
+ err = -EALREADY;
if (po->fanout)
- return -EALREADY;
+ goto out;
if (type == PACKET_FANOUT_ROLLOVER ||
(type_flags & PACKET_FANOUT_FLAG_ROLLOVER)) {
- po->rollover = kzalloc(sizeof(*po->rollover), GFP_KERNEL);
- if (!po->rollover)
- return -ENOMEM;
- atomic_long_set(&po->rollover->num, 0);
- atomic_long_set(&po->rollover->num_huge, 0);
- atomic_long_set(&po->rollover->num_failed, 0);
+ err = -ENOMEM;
+ rollover = kzalloc(sizeof(*rollover), GFP_KERNEL);
+ if (!rollover)
+ goto out;
+ atomic_long_set(&rollover->num, 0);
+ atomic_long_set(&rollover->num_huge, 0);
+ atomic_long_set(&rollover->num_failed, 0);
+ po->rollover = rollover;
}
- mutex_lock(&fanout_mutex);
match = NULL;
list_for_each_entry(f, &fanout_list, list) {
if (f->id == id &&
@@ -1712,11 +1718,11 @@ static int fanout_add(struct sock *sk, u16 id, u16 type_flags)
}
}
out:
- mutex_unlock(&fanout_mutex);
- if (err) {
- kfree(po->rollover);
+ if (err && rollover) {
+ kfree(rollover);
po->rollover = NULL;
}
+ mutex_unlock(&fanout_mutex);
return err;
}
@@ -1725,23 +1731,22 @@ static void fanout_release(struct sock *sk)
struct packet_sock *po = pkt_sk(sk);
struct packet_fanout *f;
- f = po->fanout;
- if (!f)
- return;
-
mutex_lock(&fanout_mutex);
- po->fanout = NULL;
+ f = po->fanout;
+ if (f) {
+ po->fanout = NULL;
+
+ if (atomic_dec_and_test(&f->sk_ref)) {
+ list_del(&f->list);
+ dev_remove_pack(&f->prot_hook);
+ fanout_release_data(f);
+ kfree(f);
+ }
- if (atomic_dec_and_test(&f->sk_ref)) {
- list_del(&f->list);
- dev_remove_pack(&f->prot_hook);
- fanout_release_data(f);
- kfree(f);
+ if (po->rollover)
+ kfree_rcu(po->rollover, rcu);
}
mutex_unlock(&fanout_mutex);
-
- if (po->rollover)
- kfree_rcu(po->rollover, rcu);
}
static bool packet_extra_vlan_len_allowed(const struct net_device *dev,