This is a note to let you know that I've just added the patch titled

tcp: purge write queue upon aborting the connection

to the 4.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: tcp-purge-write-queue-upon-aborting-the-connection.patch and it can be found in the queue-4.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From foo@baz Wed Mar 28 18:37:51 CEST 2018

From: Soheil Hassas Yeganeh soheil@google.com Date: Tue, 6 Mar 2018 17:15:12 -0500 Subject: tcp: purge write queue upon aborting the connection

From: Soheil Hassas Yeganeh soheil@google.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@google.com Signed-off-by: Neal Cardwell ncardwell@google.com Reviewed-by: Eric Dumazet edumazet@google.com Signed-off-by: Yuchung Cheng ycheng@google.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.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); }

Patches currently in stable-queue which might be from soheil@google.com are

queue-4.15/tcp-purge-write-queue-upon-aborting-the-connection.patch