Merge gitolite.kernel.org:/pub/scm/linux/kernel/git/davem/net

David writes:
  "Networking fixes:
   1) Prefix length validation in xfrm layer, from Steffen Klassert.

   2) TX status reporting fix in mac80211, from Andrei Otcheretianski.

   3) Fix hangs due to TX_DROP in mac80211, from Bob Copeland.

   4) Fix DMA error regression in b43, from Larry Finger.

   5) Add input validation to xenvif_set_hash_mapping(), from Jan Beulich.

   6) SMMU unmapping fix in hns driver, from Yunsheng Lin.

   7) Bluetooh crash in unpairing on SMP, from Matias Karhumaa.

   8) WoL handling fixes in the phy layer, from Heiner Kallweit.

   9) Fix deadlock in bonding, from Mahesh Bandewar.

   10) Fill ttl inherit infor in vxlan driver, from Hangbin Liu.

   11) Fix TX timeouts during netpoll, from Michael Chan.

   12) RXRPC layer fixes from David Howells.

   13) Another batch of ndo_poll_controller() removals to deal with
       excessive resource consumption during load.  From Eric Dumazet.

   14) Fix a specific TIPC failure secnario, from LUU Duc Canh.

   15) Really disable clocks in r8169 during suspend so that low
       power states can actually be reached.

   16) Fix SYN backlog lockdep issue in tcp and dccp, from Eric Dumazet.

   17) Fix RCU locking in netpoll SKB send, which shows up in bonding,
       from Dave Jones.

   18) Fix TX stalls in r8169, from Heiner Kallweit.

   19) Fix locksup in nfp due to control message storms, from Jakub
       Kicinski.

   20) Various rmnet bug fixes from Subash Abhinov Kasiviswanathan and
       Sean Tranchetti.

   21) Fix use after free in ip_cmsg_recv_dstaddr(), from Eric Dumazet."

* gitolite.kernel.org:/pub/scm/linux/kernel/git/davem/net: (122 commits)
  ixgbe: check return value of napi_complete_done()
  sctp: fix fall-through annotation
  r8169: always autoneg on resume
  ipv4: fix use-after-free in ip_cmsg_recv_dstaddr()
  net: qualcomm: rmnet: Fix incorrect allocation flag in receive path
  net: qualcomm: rmnet: Fix incorrect allocation flag in transmit
  net: qualcomm: rmnet: Skip processing loopback packets
  net: systemport: Fix wake-up interrupt race during resume
  rtnl: limit IFLA_NUM_TX_QUEUES and IFLA_NUM_RX_QUEUES to 4096
  bonding: fix warning message
  inet: make sure to grab rcu_read_lock before using ireq->ireq_opt
  nfp: avoid soft lockups under control message storm
  declance: Fix continuation with the adapter identification message
  net: fec: fix rare tx timeout
  r8169: fix network stalls due to missing bit TXCFG_AUTO_FIFO
  tun: napi flags belong to tfile
  tun: initialize napi_mutex unconditionally
  tun: remove unused parameters
  bond: take rcu lock in netpoll_send_skb_on_dev
  rtnetlink: Fail dump if target netnsid is invalid
  ...

1 files changed, 3 insertions, 1 deletions

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 4cf2f7bb2802..47e08c1b5bc3 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -6009,11 +6009,13 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb)
 			if (th->fin)
 				goto discard;
 			/* It is possible that we process SYN packets from backlog,
-			 * so we need to make sure to disable BH right there.
+			 * so we need to make sure to disable BH and RCU right there.
 			 */
+			rcu_read_lock();
 			local_bh_disable();
 			acceptable = icsk->icsk_af_ops->conn_request(sk, skb) >= 0;
 			local_bh_enable();
+			rcu_read_unlock();
 
 			if (!acceptable)
 				return 1;