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tcp: tracepoint: only call trace_tcp_send_reset with full socket

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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: c24b14c46b ("tcp: add tracepoint trace_tcp_send_reset")
Signed-off-by: Song Liu <songliubraving@fb.com>
Reviewed-by: Lawrence Brakmo <brakmo@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Song Liu 2018-02-06 20:50:23 -08:00 committed by David S. Miller
parent 043e337f55
commit 5c487bb9ad
2 changed files with 4 additions and 2 deletions
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3
net/ipv4/tcp_ipv4.c
View File

@ -705,7 +705,8 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb)
*/
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) !=

3
net/ipv6/tcp_ipv6.c
View File

@ -942,7 +942,8 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb)
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);