linux-kernel - [PATCH AUTOSEL 4.19 3/9] rxrpc: Fix local destruction being repeated

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Message-Id: <20220914090445.471489-3-sashal@kernel.org>
Date:   Wed, 14 Sep 2022 05:04:37 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     David Howells <dhowells@...hat.com>,
        Sasha Levin <sashal@...nel.org>, marc.dionne@...istor.com,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, linux-afs@...ts.infradead.org,
        netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 3/9] rxrpc: Fix local destruction being repeated

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

[ Upstream commit d3d863036d688313f8d566b87acd7d99daf82749 ]

If the local processor work item for the rxrpc local endpoint gets requeued
by an event (such as an incoming packet) between it getting scheduled for
destruction and the UDP socket being closed, the rxrpc_local_destroyer()
function can get run twice.  The second time it can hang because it can end
up waiting for cleanup events that will never happen.

Signed-off-by: David Howells <dhowells@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/rxrpc/local_object.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/rxrpc/local_object.c b/net/rxrpc/local_object.c
index fe190a6918727..5a01479aae3f3 100644
--- a/net/rxrpc/local_object.c
+++ b/net/rxrpc/local_object.c
@@ -452,6 +452,9 @@ static void rxrpc_local_processor(struct work_struct *work)
 		container_of(work, struct rxrpc_local, processor);
 	bool again;
 
+	if (local->dead)
+		return;
+
 	trace_rxrpc_local(local->debug_id, rxrpc_local_processing,
 			  atomic_read(&local->usage), NULL);
 
-- 
2.35.1