linux-kernel - [PATCH 4.15 04/47] tcp: purge write queue upon aborting the connection

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Message-Id: <20180329175729.480077131@linuxfoundation.org>
Date:   Thu, 29 Mar 2018 19:59:45 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Soheil Hassas Yeganeh <soheil@...gle.com>,
        Neal Cardwell <ncardwell@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Yuchung Cheng <ycheng@...gle.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.15 04/47] tcp: purge write queue upon aborting the connection

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

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

From: Soheil Hassas Yeganeh <soheil@...gle.com>


[ Upstream commit e05836ac07c77dd90377f8c8140bce2a44af5fe7 ]

When the connection is aborted, there is no point in
keeping the packets on the write queue until the connection
is closed.

Similar to a27fd7a8ed38 ('tcp: purge write queue upon RST'),
this is essential for a correct MSG_ZEROCOPY implementation,
because userspace cannot call close(fd) before receiving
zerocopy signals even when the connection is aborted.

Fixes: f214f915e7db ("tcp: enable MSG_ZEROCOPY")
Signed-off-by: Soheil Hassas Yeganeh <soheil@...gle.com>
Signed-off-by: Neal Cardwell <ncardwell@...gle.com>
Reviewed-by: Eric Dumazet <edumazet@...gle.com>
Signed-off-by: Yuchung Cheng <ycheng@...gle.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/ipv4/tcp.c       |    1 +
 net/ipv4/tcp_timer.c |    1 +
 2 files changed, 2 insertions(+)

--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -3542,6 +3542,7 @@ int tcp_abort(struct sock *sk, int err)
 
 	bh_unlock_sock(sk);
 	local_bh_enable();
+	tcp_write_queue_purge(sk);
 	release_sock(sk);
 	return 0;
 }
--- a/net/ipv4/tcp_timer.c
+++ b/net/ipv4/tcp_timer.c
@@ -34,6 +34,7 @@ static void tcp_write_err(struct sock *s
 	sk->sk_err = sk->sk_err_soft ? : ETIMEDOUT;
 	sk->sk_error_report(sk);
 
+	tcp_write_queue_purge(sk);
 	tcp_done(sk);
 	__NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPABORTONTIMEOUT);
 }