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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	stable@vger.kernel.org, David Howells <dhowells@redhat.com>,
	"David S. Miller" <davem@davemloft.net>
Subject: [PATCH 4.19 09/17] rxrpc: Fix sendmsg() returning EPIPE due to recvmsg() returning ENODATA
Date: Thu, 30 Jul 2020 10:04:35 +0200
Message-ID: <20200730074420.918378888@linuxfoundation.org> (raw)
In-Reply-To: <20200730074420.449233408@linuxfoundation.org>

From: David Howells <dhowells@redhat.com>

[ Upstream commit 639f181f0ee20d3249dbc55f740f0167267180f0 ]

rxrpc_sendmsg() returns EPIPE if there's an outstanding error, such as if
rxrpc_recvmsg() indicating ENODATA if there's nothing for it to read.

Change rxrpc_recvmsg() to return EAGAIN instead if there's nothing to read
as this particular error doesn't get stored in ->sk_err by the networking
core.

Also change rxrpc_sendmsg() so that it doesn't fail with delayed receive
errors (there's no way for it to report which call, if any, the error was
caused by).

Fixes: 17926a79320a ("[AF_RXRPC]: Provide secure RxRPC sockets for use by userspace and kernel both")
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/rxrpc/recvmsg.c |    2 +-
 net/rxrpc/sendmsg.c |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

--- a/net/rxrpc/recvmsg.c
+++ b/net/rxrpc/recvmsg.c
@@ -453,7 +453,7 @@ try_again:
 	    list_empty(&rx->recvmsg_q) &&
 	    rx->sk.sk_state != RXRPC_SERVER_LISTENING) {
 		release_sock(&rx->sk);
-		return -ENODATA;
+		return -EAGAIN;
 	}
 
 	if (list_empty(&rx->recvmsg_q)) {
--- a/net/rxrpc/sendmsg.c
+++ b/net/rxrpc/sendmsg.c
@@ -278,7 +278,7 @@ static int rxrpc_send_data(struct rxrpc_
 	/* this should be in poll */
 	sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
 
-	if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN))
+	if (sk->sk_shutdown & SEND_SHUTDOWN)
 		return -EPIPE;
 
 	more = msg->msg_flags & MSG_MORE;



  parent reply index

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-30  8:04 [PATCH 4.19 00/17] 4.19.136-rc1 review Greg Kroah-Hartman
2020-07-30  8:04 ` [PATCH 4.19 01/17] AX.25: Fix out-of-bounds read in ax25_connect() Greg Kroah-Hartman
2020-07-30  8:04 ` [PATCH 4.19 02/17] AX.25: Prevent out-of-bounds read in ax25_sendmsg() Greg Kroah-Hartman
2020-07-30  8:04 ` [PATCH 4.19 03/17] dev: Defer free of skbs in flush_backlog Greg Kroah-Hartman
2020-07-30  8:04 ` [PATCH 4.19 04/17] drivers/net/wan/x25_asy: Fix to make it work Greg Kroah-Hartman
2020-07-30  8:04 ` [PATCH 4.19 05/17] ip6_gre: fix null-ptr-deref in ip6gre_init_net() Greg Kroah-Hartman
2020-07-30  8:04 ` [PATCH 4.19 06/17] net-sysfs: add a newline when printing tx_timeout by sysfs Greg Kroah-Hartman
2020-07-30  8:04 ` [PATCH 4.19 07/17] net: udp: Fix wrong clean up for IS_UDPLITE macro Greg Kroah-Hartman
2020-07-30  8:04 ` [PATCH 4.19 08/17] qrtr: orphan socket in qrtr_release() Greg Kroah-Hartman
2020-07-30  8:04 ` Greg Kroah-Hartman [this message]
2020-07-30  8:04 ` [PATCH 4.19 10/17] tcp: allow at most one TLP probe per flight Greg Kroah-Hartman
2020-07-30  8:04 ` [PATCH 4.19 11/17] AX.25: Prevent integer overflows in connect and sendmsg Greg Kroah-Hartman
2020-07-30  8:04 ` [PATCH 4.19 12/17] sctp: shrink stream outq only when new outcnt < old outcnt Greg Kroah-Hartman
2020-07-30  8:04 ` [PATCH 4.19 13/17] sctp: shrink stream outq when fails to do addstream reconf Greg Kroah-Hartman
2020-07-30  8:04 ` [PATCH 4.19 14/17] udp: Copy has_conns in reuseport_grow() Greg Kroah-Hartman
2020-07-30  8:04 ` [PATCH 4.19 15/17] udp: Improve load balancing for SO_REUSEPORT Greg Kroah-Hartman
2020-07-30  8:04 ` [PATCH 4.19 16/17] rtnetlink: Fix memory(net_device) leak when ->newlink fails Greg Kroah-Hartman
2020-07-30  8:04 ` [PATCH 4.19 17/17] regmap: debugfs: check count when read regmap file Greg Kroah-Hartman
2020-07-30 16:47 ` [PATCH 4.19 00/17] 4.19.136-rc1 review Guenter Roeck
2020-07-31 12:00 ` Naresh Kamboju
2020-07-31 12:52 ` Jon Hunter

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