4.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Song Liu <songliubrav...@fb.com>


[ Upstream commit 5c487bb9adddbc1d23433e09d2548759375c2b52 ]

tracepoint tcp_send_reset requires a full socket to work. However, it
may be called when in TCP_TIME_WAIT:

        case TCP_TW_RST:
                tcp_v6_send_reset(sk, skb);
                inet_twsk_deschedule_put(inet_twsk(sk));
                goto discard_it;

To avoid this problem, this patch checks the socket with sk_fullsock()
before calling trace_tcp_send_reset().

Fixes: c24b14c46bb8 ("tcp: add tracepoint trace_tcp_send_reset")
Signed-off-by: Song Liu <songliubrav...@fb.com>
Reviewed-by: Lawrence Brakmo <bra...@fb.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 net/ipv4/tcp_ipv4.c |    3 ++-
 net/ipv6/tcp_ipv6.c |    3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -705,7 +705,8 @@ static void tcp_v4_send_reset(const stru
         */
        if (sk) {
                arg.bound_dev_if = sk->sk_bound_dev_if;
-               trace_tcp_send_reset(sk, skb);
+               if (sk_fullsock(sk))
+                       trace_tcp_send_reset(sk, skb);
        }
 
        BUILD_BUG_ON(offsetof(struct sock, sk_bound_dev_if) !=
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -943,7 +943,8 @@ static void tcp_v6_send_reset(const stru
 
        if (sk) {
                oif = sk->sk_bound_dev_if;
-               trace_tcp_send_reset(sk, skb);
+               if (sk_fullsock(sk))
+                       trace_tcp_send_reset(sk, skb);
        }
 
        tcp_v6_send_response(sk, skb, seq, ack_seq, 0, 0, 0, oif, key, 1, 0, 0);


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