11 files changed, 70 insertions, 27 deletions

diff --git a/net/core/datagram.c b/net/core/datagram.c
index e0097531417a..f5b6f43a4c2e 100644
--- a/net/core/datagram.c
+++ b/net/core/datagram.c
@@ -229,15 +229,17 @@ EXPORT_SYMBOL(skb_free_datagram);
 
 void skb_free_datagram_locked(struct sock *sk, struct sk_buff *skb)
 {
+        bool slow;
+
         if (likely(atomic_read(&skb->users) == 1))
                 smp_rmb();
         else if (likely(!atomic_dec_and_test(&skb->users)))
                 return;
 
-        lock_sock_bh(sk);
+        slow = lock_sock_fast(sk);
         skb_orphan(skb);
         sk_mem_reclaim_partial(sk);
-        unlock_sock_bh(sk);
+        unlock_sock_fast(sk, slow);
 
         /* skb is now orphaned, can be freed outside of locked section */
         __kfree_skb(skb);
diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index bff37908bd55..6ba1c0eece03 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -934,6 +934,7 @@ int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb)
                                 kfree_skb(buff);
                                 NEIGH_CACHE_STAT_INC(neigh->tbl, unres_discards);
                         }
+                        skb_dst_force(skb);
                         __skb_queue_tail(&neigh->arp_queue, skb);
                 }
                 rc = 1;
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 7ab86f3a1ea4..1a2af24e9e3d 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -650,11 +650,12 @@ static inline int rtnl_vfinfo_size(const struct net_device *dev)
         if (dev->dev.parent && dev_is_pci(dev->dev.parent)) {
 
                 int num_vfs = dev_num_vf(dev->dev.parent);
-                size_t size = nlmsg_total_size(sizeof(struct nlattr));
-                size += nlmsg_total_size(num_vfs * sizeof(struct nlattr));
-                size += num_vfs * (sizeof(struct ifla_vf_mac) +
-                                  sizeof(struct ifla_vf_vlan) +
-                                  sizeof(struct ifla_vf_tx_rate));
+                size_t size = nla_total_size(sizeof(struct nlattr));
+                size += nla_total_size(num_vfs * sizeof(struct nlattr));
+                size += num_vfs *
+                        (nla_total_size(sizeof(struct ifla_vf_mac)) +
+                         nla_total_size(sizeof(struct ifla_vf_vlan)) +
+                         nla_total_size(sizeof(struct ifla_vf_tx_rate)));
                 return size;
         } else
                 return 0;
@@ -722,14 +723,13 @@ static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
 
         for (vf = 0; vf < dev_num_vf(dev->dev.parent); vf++) {
                 vf_port = nla_nest_start(skb, IFLA_VF_PORT);
-                if (!vf_port) {
-                        nla_nest_cancel(skb, vf_ports);
-                        return -EMSGSIZE;
-                }
+                if (!vf_port)
+                        goto nla_put_failure;
                 NLA_PUT_U32(skb, IFLA_PORT_VF, vf);
                 err = dev->netdev_ops->ndo_get_vf_port(dev, vf, skb);
+                if (err == -EMSGSIZE)
+                        goto nla_put_failure;
                 if (err) {
-nla_put_failure:
                         nla_nest_cancel(skb, vf_port);
                         continue;
                 }
@@ -739,6 +739,10 @@ nla_put_failure:
         nla_nest_end(skb, vf_ports);
 
         return 0;
+
+nla_put_failure:
+        nla_nest_cancel(skb, vf_ports);
+        return -EMSGSIZE;
 }
 
 static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
@@ -753,7 +757,7 @@ static int rtnl_port_self_fill(struct sk_buff *skb, struct net_device *dev)
         err = dev->netdev_ops->ndo_get_vf_port(dev, PORT_SELF_VF, skb);
         if (err) {
                 nla_nest_cancel(skb, port_self);
-                return err;
+                return (err == -EMSGSIZE) ? err : 0;
         }
 
         nla_nest_end(skb, port_self);
diff --git a/net/core/sock.c b/net/core/sock.c
index 37fe9b6adade..2cf7f9f7e775 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -2007,6 +2007,39 @@ void release_sock(struct sock *sk)
 }
 EXPORT_SYMBOL(release_sock);
 
+/**
+ * lock_sock_fast - fast version of lock_sock
+ * @sk: socket
+ *
+ * This version should be used for very small section, where process wont block
+ * return false if fast path is taken
+ *   sk_lock.slock locked, owned = 0, BH disabled
+ * return true if slow path is taken
+ *   sk_lock.slock unlocked, owned = 1, BH enabled
+ */
+bool lock_sock_fast(struct sock *sk)
+{
+        might_sleep();
+        spin_lock_bh(&sk->sk_lock.slock);
+
+        if (!sk->sk_lock.owned)
+                /*
+                 * Note : We must disable BH
+                 */
+                return false;
+
+        __lock_sock(sk);
+        sk->sk_lock.owned = 1;
+        spin_unlock(&sk->sk_lock.slock);
+        /*
+         * The sk_lock has mutex_lock() semantics here:
+         */
+        mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
+        local_bh_enable();
+        return true;
+}
+EXPORT_SYMBOL(lock_sock_fast);
+
 int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
 {
         struct timeval tv;
diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index 45889103b3e2..856123fe32f9 100644
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -1911,7 +1911,7 @@ static int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
         struct rtattr *mp_head;
 
         /* If cache is unresolved, don't try to parse IIF and OIF */
-        if (c->mfc_parent > MAXVIFS)
+        if (c->mfc_parent >= MAXVIFS)
                 return -ENOENT;
 
         if (VIF_EXISTS(mrt, c->mfc_parent))
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index baeec29fe0f1..58585748bdac 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -1063,10 +1063,11 @@ static unsigned int first_packet_length(struct sock *sk)
         spin_unlock_bh(&rcvq->lock);
 
         if (!skb_queue_empty(&list_kill)) {
-                lock_sock_bh(sk);
+                bool slow = lock_sock_fast(sk);
+
                 __skb_queue_purge(&list_kill);
                 sk_mem_reclaim_partial(sk);
-                unlock_sock_bh(sk);
+                unlock_sock_fast(sk, slow);
         }
         return res;
 }
@@ -1123,6 +1124,7 @@ int udp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
         int peeked;
         int err;
         int is_udplite = IS_UDPLITE(sk);
+        bool slow;
 
         /*
          *      Check any passed addresses
@@ -1197,10 +1199,10 @@ out:
         return err;
 
 csum_copy_err:
-        lock_sock_bh(sk);
+        slow = lock_sock_fast(sk);
         if (!skb_kill_datagram(sk, skb, flags))
                 UDP_INC_STATS_USER(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
-        unlock_sock_bh(sk);
+        unlock_sock_fast(sk, slow);
 
         if (noblock)
                 return -EAGAIN;
@@ -1625,9 +1627,9 @@ int udp_rcv(struct sk_buff *skb)
 
 void udp_destroy_sock(struct sock *sk)
 {
-        lock_sock_bh(sk);
+        bool slow = lock_sock_fast(sk);
         udp_flush_pending_frames(sk);
-        unlock_sock_bh(sk);
+        unlock_sock_fast(sk, slow);
 }
 
 /*
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index cd963f64e27c..89425af0684c 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -507,7 +507,7 @@ int ip6_forward(struct sk_buff *skb)
         if (mtu < IPV6_MIN_MTU)
                 mtu = IPV6_MIN_MTU;
 
-        if (skb->len > mtu) {
+        if (skb->len > mtu && !skb_is_gso(skb)) {
                 /* Again, force OUTPUT device used as source address */
                 skb->dev = dst->dev;
                 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
index bd9e7d3e9c8e..073071f2b75b 100644
--- a/net/ipv6/ip6mr.c
+++ b/net/ipv6/ip6mr.c
@@ -2017,7 +2017,7 @@ static int __ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb,
         struct rtattr *mp_head;
 
         /* If cache is unresolved, don't try to parse IIF and OIF */
-        if (c->mf6c_parent > MAXMIFS)
+        if (c->mf6c_parent >= MAXMIFS)
                 return -ENOENT;
 
         if (MIF_EXISTS(mrt, c->mf6c_parent))
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 3d7a2c0b836a..87be58673b55 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -328,6 +328,7 @@ int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
         int err;
         int is_udplite = IS_UDPLITE(sk);
         int is_udp4;
+        bool slow;
 
         if (addr_len)
                 *addr_len=sizeof(struct sockaddr_in6);
@@ -424,7 +425,7 @@ out:
         return err;
 
 csum_copy_err:
-        lock_sock_bh(sk);
+        slow = lock_sock_fast(sk);
         if (!skb_kill_datagram(sk, skb, flags)) {
                 if (is_udp4)
                         UDP_INC_STATS_USER(sock_net(sk),
@@ -433,7 +434,7 @@ csum_copy_err:
                         UDP6_INC_STATS_USER(sock_net(sk),
                                         UDP_MIB_INERRORS, is_udplite);
         }
-        unlock_sock_bh(sk);
+        unlock_sock_fast(sk, slow);
 
         if (flags & MSG_DONTWAIT)
                 return -EAGAIN;
diff --git a/net/iucv/af_iucv.c b/net/iucv/af_iucv.c
index c8b4599a752e..9637e45744fa 100644
--- a/net/iucv/af_iucv.c
+++ b/net/iucv/af_iucv.c
@@ -1619,7 +1619,7 @@ static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
 save_message:
         save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
         if (!save_msg)
-                return;
+                goto out_unlock;
         save_msg->path = path;
         save_msg->msg = *msg;
 
diff --git a/net/netfilter/xt_TEE.c b/net/netfilter/xt_TEE.c
index d7920d9f49e9..859d9fd429c8 100644
--- a/net/netfilter/xt_TEE.c
+++ b/net/netfilter/xt_TEE.c
@@ -76,7 +76,7 @@ tee_tg_route4(struct sk_buff *skb, const struct xt_tee_tginfo *info)
         if (ip_route_output_key(net, &rt, &fl) != 0)
                 return false;
 
-        dst_release(skb_dst(skb));
+        skb_dst_drop(skb);
         skb_dst_set(skb, &rt->u.dst);
         skb->dev      = rt->u.dst.dev;
         skb->protocol = htons(ETH_P_IP);
@@ -157,7 +157,7 @@ tee_tg_route6(struct sk_buff *skb, const struct xt_tee_tginfo *info)
         if (dst == NULL)
                 return false;
 
-        dst_release(skb_dst(skb));
+        skb_dst_drop(skb);
         skb_dst_set(skb, dst);
         skb->dev      = dst->dev;
         skb->protocol = htons(ETH_P_IPV6);