diff options
| author | Eric Dumazet <eric.dumazet@gmail.com> | 2009-12-03 16:06:13 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-12-03 16:06:13 -0800 |
| commit | 49d09007879ce7bee36ab453c73e97c00adce884 (patch) | |
| tree | 6b6a28e0fd8befd4bad5fb1474ce4e0dea9ed6dd /net/ipv4/tcp_diag.c | |
| parent | 3320eae51d6e4c65b4733bf4d87de3b833973a1f (diff) | |
| download | lwn-49d09007879ce7bee36ab453c73e97c00adce884.tar.gz lwn-49d09007879ce7bee36ab453c73e97c00adce884.zip | |
tcp: diag: Dont report negative values for rx queue
Both netlink and /proc/net/tcp interfaces can report transient
negative values for rx queue.
ss ->
State Recv-Q Send-Q Local Address:Port Peer Address:Port
ESTAB -6 6 127.0.0.1:45956 127.0.0.1:3333
netstat ->
tcp 4294967290 6 127.0.0.1:37784 127.0.0.1:3333 ESTABLISHED
This is because we dont lock socket while computing
tp->rcv_nxt - tp->copied_seq,
and another CPU can update copied_seq before rcv_next in RX path.
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_diag.c')
| -rw-r--r-- | net/ipv4/tcp_diag.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/tcp_diag.c b/net/ipv4/tcp_diag.c index fcbcd4ff6c5f..939edb3b8e4d 100644 --- a/net/ipv4/tcp_diag.c +++ b/net/ipv4/tcp_diag.c @@ -27,7 +27,7 @@ static void tcp_diag_get_info(struct sock *sk, struct inet_diag_msg *r, r->idiag_rqueue = sk->sk_ack_backlog; r->idiag_wqueue = sk->sk_max_ack_backlog; } else { - r->idiag_rqueue = tp->rcv_nxt - tp->copied_seq; + r->idiag_rqueue = max_t(int, tp->rcv_nxt - tp->copied_seq, 0); r->idiag_wqueue = tp->write_seq - tp->snd_una; } if (info != NULL) |