20 files changed, 227 insertions, 90 deletions

diff --git a/net/8021q/vlan_core.c b/net/8021q/vlan_core.c
index c0316e0ca6e8..c584a0af77d3 100644
--- a/net/8021q/vlan_core.c
+++ b/net/8021q/vlan_core.c
@@ -11,7 +11,7 @@ int __vlan_hwaccel_rx(struct sk_buff *skb, struct vlan_group *grp,
         if (netpoll_rx(skb))
                 return NET_RX_DROP;
 
-        if (skb_bond_should_drop(skb))
+        if (skb_bond_should_drop(skb, ACCESS_ONCE(skb->dev->master)))
                 goto drop;
 
         skb->skb_iif = skb->dev->ifindex;
@@ -83,7 +83,7 @@ vlan_gro_common(struct napi_struct *napi, struct vlan_group *grp,
 {
         struct sk_buff *p;
 
-        if (skb_bond_should_drop(skb))
+        if (skb_bond_should_drop(skb, ACCESS_ONCE(skb->dev->master)))
                 goto drop;
 
         skb->skb_iif = skb->dev->ifindex;
diff --git a/net/bluetooth/hci_sysfs.c b/net/bluetooth/hci_sysfs.c
index cafb55b0cea5..05fd125f74fe 100644
--- a/net/bluetooth/hci_sysfs.c
+++ b/net/bluetooth/hci_sysfs.c
@@ -8,8 +8,7 @@
 #include <net/bluetooth/bluetooth.h>
 #include <net/bluetooth/hci_core.h>
 
-struct class *bt_class = NULL;
-EXPORT_SYMBOL_GPL(bt_class);
+static struct class *bt_class;
 
 struct dentry *bt_debugfs = NULL;
 EXPORT_SYMBOL_GPL(bt_debugfs);
diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c
index 4db7ae2fe07d..7794a2e2adce 100644
--- a/net/bluetooth/l2cap.c
+++ b/net/bluetooth/l2cap.c
@@ -40,6 +40,8 @@
 #include <linux/skbuff.h>
 #include <linux/list.h>
 #include <linux/device.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
 #include <linux/uaccess.h>
 #include <linux/crc16.h>
 #include <net/sock.h>
@@ -2830,6 +2832,11 @@ static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr
                         int len = cmd->len - sizeof(*rsp);
                         char req[64];
 
+                        if (len > sizeof(req) - sizeof(struct l2cap_conf_req)) {
+                                l2cap_send_disconn_req(conn, sk);
+                                goto done;
+                        }
+
                         /* throw out any old stored conf requests */
                         result = L2CAP_CONF_SUCCESS;
                         len = l2cap_parse_conf_rsp(sk, rsp->data,
@@ -3937,31 +3944,42 @@ drop:
         return 0;
 }
 
-static ssize_t l2cap_sysfs_show(struct class *dev,
-                                struct class_attribute *attr,
-                                char *buf)
+static int l2cap_debugfs_show(struct seq_file *f, void *p)
 {
         struct sock *sk;
         struct hlist_node *node;
-        char *str = buf;
 
         read_lock_bh(&l2cap_sk_list.lock);
 
         sk_for_each(sk, node, &l2cap_sk_list.head) {
                 struct l2cap_pinfo *pi = l2cap_pi(sk);
 
-                str += sprintf(str, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d\n",
-                                batostr(&bt_sk(sk)->src), batostr(&bt_sk(sk)->dst),
-                                sk->sk_state, __le16_to_cpu(pi->psm), pi->scid,
-                                pi->dcid, pi->imtu, pi->omtu, pi->sec_level);
+                seq_printf(f, "%s %s %d %d 0x%4.4x 0x%4.4x %d %d %d\n",
+                                        batostr(&bt_sk(sk)->src),
+                                        batostr(&bt_sk(sk)->dst),
+                                        sk->sk_state, __le16_to_cpu(pi->psm),
+                                        pi->scid, pi->dcid,
+                                        pi->imtu, pi->omtu, pi->sec_level);
         }
 
         read_unlock_bh(&l2cap_sk_list.lock);
 
-        return str - buf;
+        return 0;
 }
 
-static CLASS_ATTR(l2cap, S_IRUGO, l2cap_sysfs_show, NULL);
+static int l2cap_debugfs_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, l2cap_debugfs_show, inode->i_private);
+}
+
+static const struct file_operations l2cap_debugfs_fops = {
+        .open           = l2cap_debugfs_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+static struct dentry *l2cap_debugfs;
 
 static const struct proto_ops l2cap_sock_ops = {
         .family         = PF_BLUETOOTH,
@@ -4021,8 +4039,12 @@ static int __init l2cap_init(void)
                 goto error;
         }
 
-        if (class_create_file(bt_class, &class_attr_l2cap) < 0)
-                BT_ERR("Failed to create L2CAP info file");
+        if (bt_debugfs) {
+                l2cap_debugfs = debugfs_create_file("l2cap", 0444,
+                                        bt_debugfs, NULL, &l2cap_debugfs_fops);
+                if (!l2cap_debugfs)
+                        BT_ERR("Failed to create L2CAP debug file");
+        }
 
         BT_INFO("L2CAP ver %s", VERSION);
         BT_INFO("L2CAP socket layer initialized");
@@ -4036,7 +4058,7 @@ error:
 
 static void __exit l2cap_exit(void)
 {
-        class_remove_file(bt_class, &class_attr_l2cap);
+        debugfs_remove(l2cap_debugfs);
 
         if (bt_sock_unregister(BTPROTO_L2CAP) < 0)
                 BT_ERR("L2CAP socket unregistration failed");
diff --git a/net/bluetooth/rfcomm/core.c b/net/bluetooth/rfcomm/core.c
index db8a68e1a5ba..13f114e8b0f9 100644
--- a/net/bluetooth/rfcomm/core.c
+++ b/net/bluetooth/rfcomm/core.c
@@ -33,6 +33,8 @@
 #include <linux/init.h>
 #include <linux/wait.h>
 #include <linux/device.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
 #include <linux/net.h>
 #include <linux/mutex.h>
 #include <linux/kthread.h>
@@ -2098,13 +2100,10 @@ static struct hci_cb rfcomm_cb = {
         .security_cfm   = rfcomm_security_cfm
 };
 
-static ssize_t rfcomm_dlc_sysfs_show(struct class *dev,
-                                     struct class_attribute *attr,
-                                     char *buf)
+static int rfcomm_dlc_debugfs_show(struct seq_file *f, void *x)
 {
         struct rfcomm_session *s;
         struct list_head *pp, *p;
-        char *str = buf;
 
         rfcomm_lock();
 
@@ -2114,18 +2113,32 @@ static ssize_t rfcomm_dlc_sysfs_show(struct class *dev,
                         struct sock *sk = s->sock->sk;
                         struct rfcomm_dlc *d = list_entry(pp, struct rfcomm_dlc, list);
 
-                        str += sprintf(str, "%s %s %ld %d %d %d %d\n",
-                                        batostr(&bt_sk(sk)->src), batostr(&bt_sk(sk)->dst),
-                                        d->state, d->dlci, d->mtu, d->rx_credits, d->tx_credits);
+                        seq_printf(f, "%s %s %ld %d %d %d %d\n",
+                                                batostr(&bt_sk(sk)->src),
+                                                batostr(&bt_sk(sk)->dst),
+                                                d->state, d->dlci, d->mtu,
+                                                d->rx_credits, d->tx_credits);
                 }
         }
 
         rfcomm_unlock();
 
-        return (str - buf);
+        return 0;
 }
 
-static CLASS_ATTR(rfcomm_dlc, S_IRUGO, rfcomm_dlc_sysfs_show, NULL);
+static int rfcomm_dlc_debugfs_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, rfcomm_dlc_debugfs_show, inode->i_private);
+}
+
+static const struct file_operations rfcomm_dlc_debugfs_fops = {
+        .open           = rfcomm_dlc_debugfs_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+static struct dentry *rfcomm_dlc_debugfs;
 
 /* ---- Initialization ---- */
 static int __init rfcomm_init(void)
@@ -2142,8 +2155,12 @@ static int __init rfcomm_init(void)
                 goto unregister;
         }
 
-        if (class_create_file(bt_class, &class_attr_rfcomm_dlc) < 0)
-                BT_ERR("Failed to create RFCOMM info file");
+        if (bt_debugfs) {
+                rfcomm_dlc_debugfs = debugfs_create_file("rfcomm_dlc", 0444,
+                                bt_debugfs, NULL, &rfcomm_dlc_debugfs_fops);
+                if (!rfcomm_dlc_debugfs)
+                        BT_ERR("Failed to create RFCOMM debug file");
+        }
 
         err = rfcomm_init_ttys();
         if (err < 0)
@@ -2171,7 +2188,7 @@ unregister:
 
 static void __exit rfcomm_exit(void)
 {
-        class_remove_file(bt_class, &class_attr_rfcomm_dlc);
+        debugfs_remove(rfcomm_dlc_debugfs);
 
         hci_unregister_cb(&rfcomm_cb);
 
diff --git a/net/bluetooth/rfcomm/sock.c b/net/bluetooth/rfcomm/sock.c
index ca87d6ac6a20..7f439765403d 100644
--- a/net/bluetooth/rfcomm/sock.c
+++ b/net/bluetooth/rfcomm/sock.c
@@ -40,6 +40,8 @@
 #include <linux/skbuff.h>
 #include <linux/list.h>
 #include <linux/device.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
 #include <net/sock.h>
 
 #include <asm/system.h>
@@ -1061,28 +1063,38 @@ done:
         return result;
 }
 
-static ssize_t rfcomm_sock_sysfs_show(struct class *dev,
-                                      struct class_attribute *attr,
-                                      char *buf)
+static int rfcomm_sock_debugfs_show(struct seq_file *f, void *p)
 {
         struct sock *sk;
         struct hlist_node *node;
-        char *str = buf;
 
         read_lock_bh(&rfcomm_sk_list.lock);
 
         sk_for_each(sk, node, &rfcomm_sk_list.head) {
-                str += sprintf(str, "%s %s %d %d\n",
-                                batostr(&bt_sk(sk)->src), batostr(&bt_sk(sk)->dst),
+                seq_printf(f, "%s %s %d %d\n",
+                                batostr(&bt_sk(sk)->src),
+                                batostr(&bt_sk(sk)->dst),
                                 sk->sk_state, rfcomm_pi(sk)->channel);
         }
 
         read_unlock_bh(&rfcomm_sk_list.lock);
 
-        return (str - buf);
+        return 0;
 }
 
-static CLASS_ATTR(rfcomm, S_IRUGO, rfcomm_sock_sysfs_show, NULL);
+static int rfcomm_sock_debugfs_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, rfcomm_sock_debugfs_show, inode->i_private);
+}
+
+static const struct file_operations rfcomm_sock_debugfs_fops = {
+        .open           = rfcomm_sock_debugfs_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+static struct dentry *rfcomm_sock_debugfs;
 
 static const struct proto_ops rfcomm_sock_ops = {
         .family         = PF_BLUETOOTH,
@@ -1122,8 +1134,12 @@ int __init rfcomm_init_sockets(void)
         if (err < 0)
                 goto error;
 
-        if (class_create_file(bt_class, &class_attr_rfcomm) < 0)
-                BT_ERR("Failed to create RFCOMM info file");
+        if (bt_debugfs) {
+                rfcomm_sock_debugfs = debugfs_create_file("rfcomm", 0444,
+                                bt_debugfs, NULL, &rfcomm_sock_debugfs_fops);
+                if (!rfcomm_sock_debugfs)
+                        BT_ERR("Failed to create RFCOMM debug file");
+        }
 
         BT_INFO("RFCOMM socket layer initialized");
 
@@ -1137,7 +1153,7 @@ error:
 
 void rfcomm_cleanup_sockets(void)
 {
-        class_remove_file(bt_class, &class_attr_rfcomm);
+        debugfs_remove(rfcomm_sock_debugfs);
 
         if (bt_sock_unregister(BTPROTO_RFCOMM) < 0)
                 BT_ERR("RFCOMM socket layer unregistration failed");
diff --git a/net/bluetooth/sco.c b/net/bluetooth/sco.c
index f93b939539bc..e5b16b76b22e 100644
--- a/net/bluetooth/sco.c
+++ b/net/bluetooth/sco.c
@@ -38,6 +38,8 @@
 #include <linux/socket.h>
 #include <linux/skbuff.h>
 #include <linux/device.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
 #include <linux/list.h>
 #include <net/sock.h>
 
@@ -953,28 +955,36 @@ drop:
         return 0;
 }
 
-static ssize_t sco_sysfs_show(struct class *dev,
-                                struct class_attribute *attr,
-                                char *buf)
+static int sco_debugfs_show(struct seq_file *f, void *p)
 {
         struct sock *sk;
         struct hlist_node *node;
-        char *str = buf;
 
         read_lock_bh(&sco_sk_list.lock);
 
         sk_for_each(sk, node, &sco_sk_list.head) {
-                str += sprintf(str, "%s %s %d\n",
-                                batostr(&bt_sk(sk)->src), batostr(&bt_sk(sk)->dst),
-                                sk->sk_state);
+                seq_printf(f, "%s %s %d\n", batostr(&bt_sk(sk)->src),
+                                batostr(&bt_sk(sk)->dst), sk->sk_state);
         }
 
         read_unlock_bh(&sco_sk_list.lock);
 
-        return (str - buf);
+        return 0;
 }
 
-static CLASS_ATTR(sco, S_IRUGO, sco_sysfs_show, NULL);
+static int sco_debugfs_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, sco_debugfs_show, inode->i_private);
+}
+
+static const struct file_operations sco_debugfs_fops = {
+        .open           = sco_debugfs_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+static struct dentry *sco_debugfs;
 
 static const struct proto_ops sco_sock_ops = {
         .family         = PF_BLUETOOTH,
@@ -1032,8 +1042,12 @@ static int __init sco_init(void)
                 goto error;
         }
 
-        if (class_create_file(bt_class, &class_attr_sco) < 0)
-                BT_ERR("Failed to create SCO info file");
+        if (bt_debugfs) {
+                sco_debugfs = debugfs_create_file("sco", 0444,
+                                        bt_debugfs, NULL, &sco_debugfs_fops);
+                if (!sco_debugfs)
+                        BT_ERR("Failed to create SCO debug file");
+        }
 
         BT_INFO("SCO (Voice Link) ver %s", VERSION);
         BT_INFO("SCO socket layer initialized");
@@ -1047,7 +1061,7 @@ error:
 
 static void __exit sco_exit(void)
 {
-        class_remove_file(bt_class, &class_attr_sco);
+        debugfs_remove(sco_debugfs);
 
         if (bt_sock_unregister(BTPROTO_SCO) < 0)
                 BT_ERR("SCO socket unregistration failed");
diff --git a/net/core/dev.c b/net/core/dev.c
index bcc490cc9452..59d4394d2ce8 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2483,6 +2483,7 @@ int netif_receive_skb(struct sk_buff *skb)
 {
         struct packet_type *ptype, *pt_prev;
         struct net_device *orig_dev;
+        struct net_device *master;
         struct net_device *null_or_orig;
         struct net_device *null_or_bond;
         int ret = NET_RX_DROP;
@@ -2503,11 +2504,12 @@ int netif_receive_skb(struct sk_buff *skb)
 
         null_or_orig = NULL;
         orig_dev = skb->dev;
-        if (orig_dev->master) {
-                if (skb_bond_should_drop(skb))
+        master = ACCESS_ONCE(orig_dev->master);
+        if (master) {
+                if (skb_bond_should_drop(skb, master))
                         null_or_orig = orig_dev; /* deliver only exact match */
                 else
-                        skb->dev = orig_dev->master;
+                        skb->dev = master;
         }
 
         __get_cpu_var(netdev_rx_stat).total++;
diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index af5d89792860..01ef8ba9025c 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -961,7 +961,9 @@ fib_find_node(struct trie *t, u32 key)
         struct node *n;
 
         pos = 0;
-        n = rcu_dereference(t->trie);
+        n = rcu_dereference_check(t->trie,
+                                  rcu_read_lock_held() ||
+                                  lockdep_rtnl_is_held());
 
         while (n != NULL &&  NODE_TYPE(n) == T_TNODE) {
                 tn = (struct tnode *) n;
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index f47c9f76754b..f78402d097b3 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -810,11 +810,13 @@ static netdev_tx_t ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev
                         tunnel->err_count = 0;
         }
 
-        max_headroom = LL_RESERVED_SPACE(tdev) + gre_hlen;
+        max_headroom = LL_RESERVED_SPACE(tdev) + gre_hlen + rt->u.dst.header_len;
 
         if (skb_headroom(skb) < max_headroom || skb_shared(skb)||
             (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
                 struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
+                if (max_headroom > dev->needed_headroom)
+                        dev->needed_headroom = max_headroom;
                 if (!new_skb) {
                         ip_rt_put(rt);
                         txq->tx_dropped++;
diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index 8582e12e4a62..0b9d03c54dc3 100644
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -802,6 +802,9 @@ static int ipmr_mfc_add(struct net *net, struct mfcctl *mfc, int mrtsock)
         int line;
         struct mfc_cache *uc, *c, **cp;
 
+        if (mfc->mfcc_parent >= MAXVIFS)
+                return -ENFILE;
+
         line = MFC_HASH(mfc->mfcc_mcastgrp.s_addr, mfc->mfcc_origin.s_addr);
 
         for (cp = &net->ipv4.mfc_cache_array[line];
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index a770df2493d2..54fd68c14c87 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1441,7 +1441,7 @@ void ip_rt_redirect(__be32 old_gw, __be32 daddr, __be32 new_gw,
                                         dev_hold(rt->u.dst.dev);
                                 if (rt->idev)
                                         in_dev_hold(rt->idev);
-                                rt->u.dst.obsolete      = 0;
+                                rt->u.dst.obsolete      = -1;
                                 rt->u.dst.lastuse       = jiffies;
                                 rt->u.dst.path          = &rt->u.dst;
                                 rt->u.dst.neighbour     = NULL;
@@ -1506,11 +1506,12 @@ static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst)
         struct dst_entry *ret = dst;
 
         if (rt) {
-                if (dst->obsolete) {
+                if (dst->obsolete > 0) {
                         ip_rt_put(rt);
                         ret = NULL;
                 } else if ((rt->rt_flags & RTCF_REDIRECTED) ||
-                           rt->u.dst.expires) {
+                           (rt->u.dst.expires &&
+                            time_after_eq(jiffies, rt->u.dst.expires))) {
                         unsigned hash = rt_hash(rt->fl.fl4_dst, rt->fl.fl4_src,
                                                 rt->fl.oif,
                                                 rt_genid(dev_net(dst->dev)));
@@ -1726,7 +1727,9 @@ static void ip_rt_update_pmtu(struct dst_entry *dst, u32 mtu)
 
 static struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie)
 {
-        return NULL;
+        if (rt_is_expired((struct rtable *)dst))
+                return NULL;
+        return dst;
 }
 
 static void ipv4_dst_destroy(struct dst_entry *dst)
@@ -1888,7 +1891,8 @@ static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr,
         if (!rth)
                 goto e_nobufs;
 
-        rth->u.dst.output= ip_rt_bug;
+        rth->u.dst.output = ip_rt_bug;
+        rth->u.dst.obsolete = -1;
 
         atomic_set(&rth->u.dst.__refcnt, 1);
         rth->u.dst.flags= DST_HOST;
@@ -2054,6 +2058,7 @@ static int __mkroute_input(struct sk_buff *skb,
         rth->fl.oif     = 0;
         rth->rt_spec_dst= spec_dst;
 
+        rth->u.dst.obsolete = -1;
         rth->u.dst.input = ip_forward;
         rth->u.dst.output = ip_output;
         rth->rt_genid = rt_genid(dev_net(rth->u.dst.dev));
@@ -2218,6 +2223,7 @@ local_input:
                 goto e_nobufs;
 
         rth->u.dst.output= ip_rt_bug;
+        rth->u.dst.obsolete = -1;
         rth->rt_genid = rt_genid(net);
 
         atomic_set(&rth->u.dst.__refcnt, 1);
@@ -2444,6 +2450,7 @@ static int __mkroute_output(struct rtable **result,
         rth->rt_spec_dst= fl->fl4_src;
 
         rth->u.dst.output=ip_output;
+        rth->u.dst.obsolete = -1;
         rth->rt_genid = rt_genid(dev_net(dev_out));
 
         RT_CACHE_STAT_INC(out_slow_tot);
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 5901010fad55..6afb6d8662b2 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -429,7 +429,7 @@ unsigned int tcp_poll(struct file *file, struct socket *sock, poll_table *wait)
                 if (tp->urg_seq == tp->copied_seq &&
                     !sock_flag(sk, SOCK_URGINLINE) &&
                     tp->urg_data)
-                        target--;
+                        target++;
 
                 /* Potential race condition. If read of tp below will
                  * escape above sk->sk_state, we can be illegally awaken
@@ -1254,6 +1254,39 @@ static void tcp_prequeue_process(struct sock *sk)
         tp->ucopy.memory = 0;
 }
 
+#ifdef CONFIG_NET_DMA
+static void tcp_service_net_dma(struct sock *sk, bool wait)
+{
+        dma_cookie_t done, used;
+        dma_cookie_t last_issued;
+        struct tcp_sock *tp = tcp_sk(sk);
+
+        if (!tp->ucopy.dma_chan)
+                return;
+
+        last_issued = tp->ucopy.dma_cookie;
+        dma_async_memcpy_issue_pending(tp->ucopy.dma_chan);
+
+        do {
+                if (dma_async_memcpy_complete(tp->ucopy.dma_chan,
+                                              last_issued, &done,
+                                              &used) == DMA_SUCCESS) {
+                        /* Safe to free early-copied skbs now */
+                        __skb_queue_purge(&sk->sk_async_wait_queue);
+                        break;
+                } else {
+                        struct sk_buff *skb;
+                        while ((skb = skb_peek(&sk->sk_async_wait_queue)) &&
+                               (dma_async_is_complete(skb->dma_cookie, done,
+                                                      used) == DMA_SUCCESS)) {
+                                __skb_dequeue(&sk->sk_async_wait_queue);
+                                kfree_skb(skb);
+                        }
+                }
+        } while (wait);
+}
+#endif
+
 static inline struct sk_buff *tcp_recv_skb(struct sock *sk, u32 seq, u32 *off)
 {
         struct sk_buff *skb;
@@ -1546,6 +1579,10 @@ int tcp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
                         /* __ Set realtime policy in scheduler __ */
                 }
 
+#ifdef CONFIG_NET_DMA
+                if (tp->ucopy.dma_chan)
+                        dma_async_memcpy_issue_pending(tp->ucopy.dma_chan);
+#endif
                 if (copied >= target) {
                         /* Do not sleep, just process backlog. */
                         release_sock(sk);
@@ -1554,6 +1591,7 @@ int tcp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
                         sk_wait_data(sk, &timeo);
 
 #ifdef CONFIG_NET_DMA
+                tcp_service_net_dma(sk, false);  /* Don't block */
                 tp->ucopy.wakeup = 0;
 #endif
 
@@ -1633,6 +1671,9 @@ do_prequeue:
                                                 copied = -EFAULT;
                                         break;
                                 }
+
+                                dma_async_memcpy_issue_pending(tp->ucopy.dma_chan);
+
                                 if ((offset + used) == skb->len)
                                         copied_early = 1;
 
@@ -1702,27 +1743,9 @@ skip_copy:
         }
 
 #ifdef CONFIG_NET_DMA
-        if (tp->ucopy.dma_chan) {
-                dma_cookie_t done, used;
-
-                dma_async_memcpy_issue_pending(tp->ucopy.dma_chan);
-
-                while (dma_async_memcpy_complete(tp->ucopy.dma_chan,
-                                                 tp->ucopy.dma_cookie, &done,
-                                                 &used) == DMA_IN_PROGRESS) {
-                        /* do partial cleanup of sk_async_wait_queue */
-                        while ((skb = skb_peek(&sk->sk_async_wait_queue)) &&
-                               (dma_async_is_complete(skb->dma_cookie, done,
-                                                      used) == DMA_SUCCESS)) {
-                                __skb_dequeue(&sk->sk_async_wait_queue);
-                                kfree_skb(skb);
-                        }
-                }
+        tcp_service_net_dma(sk, true);  /* Wait for queue to drain */
+        tp->ucopy.dma_chan = NULL;
 
-                /* Safe to free early-copied skbs now */
-                __skb_queue_purge(&sk->sk_async_wait_queue);
-                tp->ucopy.dma_chan = NULL;
-        }
         if (tp->ucopy.pinned_list) {
                 dma_unpin_iovec_pages(tp->ucopy.pinned_list);
                 tp->ucopy.pinned_list = NULL;
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 788851ca8c5d..c096a4218b8f 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -2511,6 +2511,9 @@ static void tcp_mark_head_lost(struct sock *sk, int packets)
         int err;
         unsigned int mss;
 
+        if (packets == 0)
+                return;
+
         WARN_ON(packets > tp->packets_out);
         if (tp->lost_skb_hint) {
                 skb = tp->lost_skb_hint;
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 70df40980a87..f4df5f931f36 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -370,6 +370,11 @@ void tcp_v4_err(struct sk_buff *icmp_skb, u32 info)
         if (sk->sk_state == TCP_CLOSE)
                 goto out;
 
+        if (unlikely(iph->ttl < inet_sk(sk)->min_ttl)) {
+                NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP);
+                goto out;
+        }
+
         icsk = inet_csk(sk);
         tp = tcp_sk(sk);
         seq = ntohl(th->seq);
diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
index 52e0f74fdfe0..23e4ac0cc30e 100644
--- a/net/ipv6/ip6mr.c
+++ b/net/ipv6/ip6mr.c
@@ -1113,6 +1113,9 @@ static int ip6mr_mfc_add(struct net *net, struct mf6cctl *mfc, int mrtsock)
         unsigned char ttls[MAXMIFS];
         int i;
 
+        if (mfc->mf6cc_parent >= MAXMIFS)
+                return -ENFILE;
+
         memset(ttls, 255, MAXMIFS);
         for (i = 0; i < MAXMIFS; i++) {
                 if (IF_ISSET(i, &mfc->mf6cc_ifset))
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 52cd3eff31dc..7fcb0e5d1213 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -879,7 +879,7 @@ static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
 
         rt = (struct rt6_info *) dst;
 
-        if (rt && rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie))
+        if (rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie))
                 return dst;
 
         return NULL;
diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index 2b2af631d2b8..569410a85953 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -582,7 +582,9 @@ nla_put_failure:
 nlmsg_failure:
         kfree_skb(skb);
 errout:
-        nfnetlink_set_err(net, 0, group, -ENOBUFS);
+        if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
+                return -ENOBUFS;
+
         return 0;
 }
 #endif /* CONFIG_NF_CONNTRACK_EVENTS */
diff --git a/net/netfilter/nfnetlink.c b/net/netfilter/nfnetlink.c
index 8eb0cc23ada3..6afa3d52ea5f 100644
--- a/net/netfilter/nfnetlink.c
+++ b/net/netfilter/nfnetlink.c
@@ -113,9 +113,9 @@ int nfnetlink_send(struct sk_buff *skb, struct net *net, u32 pid,
 }
 EXPORT_SYMBOL_GPL(nfnetlink_send);
 
-void nfnetlink_set_err(struct net *net, u32 pid, u32 group, int error)
+int nfnetlink_set_err(struct net *net, u32 pid, u32 group, int error)
 {
-        netlink_set_err(net->nfnl, pid, group, error);
+        return netlink_set_err(net->nfnl, pid, group, error);
 }
 EXPORT_SYMBOL_GPL(nfnetlink_set_err);
 
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 320d0423a240..acbbae1e89b5 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -1093,6 +1093,7 @@ static inline int do_one_set_err(struct sock *sk,
                                  struct netlink_set_err_data *p)
 {
         struct netlink_sock *nlk = nlk_sk(sk);
+        int ret = 0;
 
         if (sk == p->exclude_sk)
                 goto out;
@@ -1104,10 +1105,15 @@ static inline int do_one_set_err(struct sock *sk,
             !test_bit(p->group - 1, nlk->groups))
                 goto out;
 
+        if (p->code == ENOBUFS && nlk->flags & NETLINK_RECV_NO_ENOBUFS) {
+                ret = 1;
+                goto out;
+        }
+
         sk->sk_err = p->code;
         sk->sk_error_report(sk);
 out:
-        return 0;
+        return ret;
 }
 
 /**
@@ -1116,12 +1122,16 @@ out:
  * @pid: the PID of a process that we want to skip (if any)
  * @groups: the broadcast group that will notice the error
  * @code: error code, must be negative (as usual in kernelspace)
+ *
+ * This function returns the number of broadcast listeners that have set the
+ * NETLINK_RECV_NO_ENOBUFS socket option.
  */
-void netlink_set_err(struct sock *ssk, u32 pid, u32 group, int code)
+int netlink_set_err(struct sock *ssk, u32 pid, u32 group, int code)
 {
         struct netlink_set_err_data info;
         struct hlist_node *node;
         struct sock *sk;
+        int ret = 0;
 
         info.exclude_sk = ssk;
         info.pid = pid;
@@ -1132,9 +1142,10 @@ void netlink_set_err(struct sock *ssk, u32 pid, u32 group, int code)
         read_lock(&nl_table_lock);
 
         sk_for_each_bound(sk, node, &nl_table[ssk->sk_protocol].mc_list)
-                do_one_set_err(sk, &info);
+                ret += do_one_set_err(sk, &info);
 
         read_unlock(&nl_table_lock);
+        return ret;
 }
 EXPORT_SYMBOL(netlink_set_err);
 
diff --git a/net/rxrpc/ar-accept.c b/net/rxrpc/ar-accept.c
index 77228f28fa36..2d744f22a9a1 100644
--- a/net/rxrpc/ar-accept.c
+++ b/net/rxrpc/ar-accept.c
@@ -88,6 +88,11 @@ static int rxrpc_accept_incoming_call(struct rxrpc_local *local,
 
         /* get a notification message to send to the server app */
         notification = alloc_skb(0, GFP_NOFS);
+        if (!notification) {
+                _debug("no memory");
+                ret = -ENOMEM;
+                goto error_nofree;
+        }
         rxrpc_new_skb(notification);
         notification->mark = RXRPC_SKB_MARK_NEW_CALL;
 
@@ -189,6 +194,7 @@ invalid_service:
         ret = -ECONNREFUSED;
 error:
         rxrpc_free_skb(notification);
+error_nofree:
         _leave(" = %d", ret);
         return ret;
 }