tcp: repair: fix TCP_QUEUE_SEQ implementation

When application uses TCP_QUEUE_SEQ socket option to
change tp->rcv_next, we must also update tp->copied_seq.

Otherwise, stuff relying on tcp_inq() being precise can
eventually be confused.

For example, tcp_zerocopy_receive() might crash because
it does not expect tcp_recv_skb() to return NULL.

We could add tests in various places to fix the issue,
or simply make sure tcp_inq() wont return a random value,
and leave fast path as it is.

Note that this fixes ioctl(fd, SIOCINQ, &val) at the same
time.

Fixes: ee9952831cfd ("tcp: Initial repair mode")
Fixes: 05255b823a61 ("tcp: add TCP_ZEROCOPY_RECEIVE support for zerocopy receive")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index eb2d805..dc77c30 100644 (file)
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -2948,8 +2948,10 @@ static int do_tcp_setsockopt(struct sock *sk, int level,
                        err = -EPERM;
                else if (tp->repair_queue == TCP_SEND_QUEUE)
                        WRITE_ONCE(tp->write_seq, val);
-               else if (tp->repair_queue == TCP_RECV_QUEUE)
+               else if (tp->repair_queue == TCP_RECV_QUEUE) {
                        WRITE_ONCE(tp->rcv_nxt, val);
+                       WRITE_ONCE(tp->copied_seq, val);
+               }
                else
                        err = -EINVAL;
                break;