linux-kernel - [PATCH net 1/6] rxrpc: Clear socket error

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Message-ID: <155508322002.11035.7602569766057291907.stgit@warthog.procyon.org.uk>
Date:   Fri, 12 Apr 2019 16:33:40 +0100
From:   David Howells <dhowells@...hat.com>
To:     netdev@...r.kernel.org
Cc:     dhowells@...hat.com, linux-afs@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH net 1/6] rxrpc: Clear socket error

From: Marc Dionne <marc.dionne@...istor.com>

When an ICMP or ICMPV6 error is received, the error will be attached
to the socket (sk_err) and the report function will get called.
Clear any pending error here by calling sock_error().

This would cause the following attempt to use the socket to fail with
the error code stored by the ICMP error, resulting in unexpected errors
with various side effects depending on the context.

Signed-off-by: Marc Dionne <marc.dionne@...istor.com>
Signed-off-by: David Howells <dhowells@...hat.com>
Tested-by: Jonathan Billings <jsbillin@...ch.edu>
---

 net/rxrpc/peer_event.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/net/rxrpc/peer_event.c b/net/rxrpc/peer_event.c
index bc05af89fc38..6e84d878053c 100644
--- a/net/rxrpc/peer_event.c
+++ b/net/rxrpc/peer_event.c
@@ -157,6 +157,11 @@ void rxrpc_error_report(struct sock *sk)
 
 	_enter("%p{%d}", sk, local->debug_id);
 
+	/* Clear the outstanding error value on the socket so that it doesn't
+	 * cause kernel_sendmsg() to return it later.
+	 */
+	sock_error(sk);
+
 	skb = sock_dequeue_err_skb(sk);
 	if (!skb) {
 		_leave("UDP socket errqueue empty");