Commit 8accd04e authored by Soheil Hassas Yeganeh's avatar Soheil Hassas Yeganeh Committed by Greg Kroah-Hartman

tcp: do not report TCP_CM_INQ of 0 for closed connections

[ Upstream commit 6466e715 ]

Returning 0 as inq to userspace indicates there is no more data to
read, and the application needs to wait for EPOLLIN. For a connection
that has received FIN from the remote peer, however, the application
must continue reading until getting EOF (return value of 0
from tcp_recvmsg) or an error, if edge-triggered epoll (EPOLLET) is
being used. Otherwise, the application will never receive a new
EPOLLIN, since there is no epoll edge after the FIN.

Return 1 when there is no data left on the queue but the
connection has received FIN, so that the applications continue
reading.

Fixes: b75eba76 (tcp: send in-queue bytes in cmsg upon read)
Signed-off-by: default avatarSoheil Hassas Yeganeh <soheil@google.com>
Acked-by: default avatarNeal Cardwell <ncardwell@google.com>
Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Acked-by: default avatarYuchung Cheng <ycheng@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 0e6b33fa
...@@ -1901,6 +1901,11 @@ static int tcp_inq_hint(struct sock *sk) ...@@ -1901,6 +1901,11 @@ static int tcp_inq_hint(struct sock *sk)
inq = tp->rcv_nxt - tp->copied_seq; inq = tp->rcv_nxt - tp->copied_seq;
release_sock(sk); release_sock(sk);
} }
/* After receiving a FIN, tell the user-space to continue reading
* by returning a non-zero inq.
*/
if (inq == 0 && sock_flag(sk, SOCK_DONE))
inq = 1;
return inq; return inq;
} }
......
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