diff options
Diffstat (limited to 'net/core')
| -rw-r--r-- | net/core/net_namespace.c | 13 | ||||
| -rw-r--r-- | net/core/rtnetlink.c | 2 | ||||
| -rw-r--r-- | net/core/sock.c | 4 |
3 files changed, 13 insertions, 6 deletions
diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c index 534a53124d14..5827de79610b 100644 --- a/net/core/net_namespace.c +++ b/net/core/net_namespace.c @@ -71,12 +71,15 @@ static unsigned int max_gen_ptrs = INITIAL_NET_GEN_PTRS; static struct net_generic *net_alloc_generic(void) { + unsigned int gen_ptrs = READ_ONCE(max_gen_ptrs); + unsigned int generic_size; struct net_generic *ng; - unsigned int generic_size = offsetof(struct net_generic, ptr[max_gen_ptrs]); + + generic_size = offsetof(struct net_generic, ptr[gen_ptrs]); ng = kzalloc(generic_size, GFP_KERNEL); if (ng) - ng->s.len = max_gen_ptrs; + ng->s.len = gen_ptrs; return ng; } @@ -1231,7 +1234,11 @@ static int register_pernet_operations(struct list_head *list, if (error < 0) return error; *ops->id = error; - max_gen_ptrs = max(max_gen_ptrs, *ops->id + 1); + /* This does not require READ_ONCE as writers already hold + * pernet_ops_rwsem. But WRITE_ONCE is needed to protect + * net_alloc_generic. + */ + WRITE_ONCE(max_gen_ptrs, max(max_gen_ptrs, *ops->id + 1)); } error = __register_pernet_operations(list, ops); if (error) { diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index ee599636f817..2b7ad5cf8fbf 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -2252,7 +2252,7 @@ static int do_setvfinfo(struct net_device *dev, struct nlattr **tb) nla_for_each_nested(attr, tb[IFLA_VF_VLAN_LIST], rem) { if (nla_type(attr) != IFLA_VF_VLAN_INFO || - nla_len(attr) < NLA_HDRLEN) { + nla_len(attr) < sizeof(struct ifla_vf_vlan_info)) { return -EINVAL; } if (len >= MAX_VLAN_LIST_LEN) diff --git a/net/core/sock.c b/net/core/sock.c index daeb0e69c71b..2b68a93adfa8 100644 --- a/net/core/sock.c +++ b/net/core/sock.c @@ -453,7 +453,7 @@ int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) unsigned long flags; struct sk_buff_head *list = &sk->sk_receive_queue; - if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) { + if (atomic_read(&sk->sk_rmem_alloc) >= READ_ONCE(sk->sk_rcvbuf)) { atomic_inc(&sk->sk_drops); trace_sock_rcvqueue_full(sk, skb); return -ENOMEM; @@ -505,7 +505,7 @@ int __sk_receive_skb(struct sock *sk, struct sk_buff *skb, skb->dev = NULL; - if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) { + if (sk_rcvqueues_full(sk, READ_ONCE(sk->sk_rcvbuf))) { atomic_inc(&sk->sk_drops); goto discard_and_relse; } |