linux-kernel - [PATCH AUTOSEL 5.2 060/123] rxrpc: Fix the lack of notification when sendmsg() fails on a DATA packet

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Message-Id: <20190814021047.14828-60-sashal@kernel.org>
Date:   Tue, 13 Aug 2019 22:09:44 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     David Howells <dhowells@...hat.com>,
        Marc Dionne <marc.dionne@...istor.com>,
        Jeffrey Altman <jaltman@...istor.com>,
        Sasha Levin <sashal@...nel.org>, linux-afs@...ts.infradead.org,
        netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 5.2 060/123] rxrpc: Fix the lack of notification when sendmsg() fails on a DATA packet

From: David Howells <dhowells@...hat.com>

[ Upstream commit c69565ee6681e151e2bb80502930a16e04b553d1 ]

Fix the fact that a notification isn't sent to the recvmsg side to indicate
a call failed when sendmsg() fails to transmit a DATA packet with the error
ENETUNREACH, EHOSTUNREACH or ECONNREFUSED.

Without this notification, the afs client just sits there waiting for the
call to complete in some manner (which it's not now going to do), which
also pins the rxrpc call in place.

This can be seen if the client has a scope-level IPv6 address, but not a
global-level IPv6 address, and we try and transmit an operation to a
server's IPv6 address.

Looking in /proc/net/rxrpc/calls shows completed calls just sat there with
an abort code of RX_USER_ABORT and an error code of -ENETUNREACH.

Fixes: c54e43d752c7 ("rxrpc: Fix missing start of call timeout")
Signed-off-by: David Howells <dhowells@...hat.com>
Reviewed-by: Marc Dionne <marc.dionne@...istor.com>
Reviewed-by: Jeffrey Altman <jaltman@...istor.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/rxrpc/sendmsg.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/rxrpc/sendmsg.c b/net/rxrpc/sendmsg.c
index 5d3f33ce6d410..bae14438f8691 100644
--- a/net/rxrpc/sendmsg.c
+++ b/net/rxrpc/sendmsg.c
@@ -226,6 +226,7 @@ static int rxrpc_queue_packet(struct rxrpc_sock *rx, struct rxrpc_call *call,
 			rxrpc_set_call_completion(call,
 						  RXRPC_CALL_LOCAL_ERROR,
 						  0, ret);
+			rxrpc_notify_socket(call);
 			goto out;
 		}
 		_debug("need instant resend %d", ret);
-- 
2.20.1