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

Pull networking fixes from David Miller:
 "Just the usual assortment of small'ish fixes:

   1) Conntrack timeout is sometimes not initialized properly, from
      Alexander Potapenko.

   2) Add a reasonable range limit to tcp_min_rtt_wlen to avoid
      undefined behavior. From ZhangXiaoxu.

   3) des1 field of descriptor in stmmac driver is initialized with the
      wrong variable. From Yue Haibing.

   4) Increase mlxsw pci sw reset timeout a little bit more, from Ido
      Schimmel.

   5) Match IOT2000 stmmac devices more accurately, from Su Bao Cheng.

   6) Fallback refcount fix in TLS code, from Jakub Kicinski.

   7) Fix max MTU check when using XDP in mlx5, from Maxim Mikityanskiy.

   8) Fix recursive locking in team driver, from Hangbin Liu.

   9) Fix tls_set_device_offload_Rx() deadlock, from Jakub Kicinski.

  10) Don't use napi_alloc_frag() outside of softiq context of socionext
      driver, from Ilias Apalodimas.

  11) MAC address increment overflow in ncsi, from Tao Ren.

  12) Fix a regression in 8K/1M pool switching of RDS, from Zhu Yanjun.

  13) ipv4_link_failure has to validate the headers that are actually
      there because RAW sockets can pass in arbitrary garbage, from Eric
      Dumazet"

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (43 commits)
  ipv4: add sanity checks in ipv4_link_failure()
  net/rose: fix unbound loop in rose_loopback_timer()
  rxrpc: fix race condition in rxrpc_input_packet()
  net: rds: exchange of 8K and 1M pool
  net: vrf: Fix operation not supported when set vrf mac
  net/ncsi: handle overflow when incrementing mac address
  net: socionext: replace napi_alloc_frag with the netdev variant on init
  net: atheros: fix spelling mistake "underun" -> "underrun"
  spi: ST ST95HF NFC: declare missing of table
  spi: Micrel eth switch: declare missing of table
  net: stmmac: move stmmac_check_ether_addr() to driver probe
  netfilter: fix nf_l4proto_log_invalid to log invalid packets
  netfilter: never get/set skb->tstamp
  netfilter: ebtables: CONFIG_COMPAT: drop a bogus WARN_ON
  Documentation: decnet: remove reference to CONFIG_DECNET_ROUTE_FWMARK
  dt-bindings: add an explanation for internal phy-mode
  net/tls: don't leak IV and record seq when offload fails
  net/tls: avoid potential deadlock in tls_set_device_offload_rx()
  selftests/net: correct the return value for run_afpackettests
  team: fix possible recursive locking when add slaves
  ...

1 files changed, 8 insertions, 4 deletions

diff --git a/net/rxrpc/input.c b/net/rxrpc/input.c
index 4c6f9d0a00e7..c2c35cf4e308 100644
--- a/net/rxrpc/input.c
+++ b/net/rxrpc/input.c
@@ -1161,19 +1161,19 @@ int rxrpc_extract_header(struct rxrpc_skb_priv *sp, struct sk_buff *skb)
  * handle data received on the local endpoint
  * - may be called in interrupt context
  *
- * The socket is locked by the caller and this prevents the socket from being
- * shut down and the local endpoint from going away, thus sk_user_data will not
- * be cleared until this function returns.
+ * [!] Note that as this is called from the encap_rcv hook, the socket is not
+ * held locked by the caller and nothing prevents sk_user_data on the UDP from
+ * being cleared in the middle of processing this function.
  *
  * Called with the RCU read lock held from the IP layer via UDP.
  */
 int rxrpc_input_packet(struct sock *udp_sk, struct sk_buff *skb)
 {
+	struct rxrpc_local *local = rcu_dereference_sk_user_data(udp_sk);
 	struct rxrpc_connection *conn;
 	struct rxrpc_channel *chan;
 	struct rxrpc_call *call = NULL;
 	struct rxrpc_skb_priv *sp;
-	struct rxrpc_local *local = udp_sk->sk_user_data;
 	struct rxrpc_peer *peer = NULL;
 	struct rxrpc_sock *rx = NULL;
 	unsigned int channel;
@@ -1181,6 +1181,10 @@ int rxrpc_input_packet(struct sock *udp_sk, struct sk_buff *skb)
 
 	_enter("%p", udp_sk);
 
+	if (unlikely(!local)) {
+		kfree_skb(skb);
+		return 0;
+	}
 	if (skb->tstamp == 0)
 		skb->tstamp = ktime_get_real();