linux-kernel - [PATCH AUTOSEL 4.4 15/21] SUNRPC: Fix a race with XPRT

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Message-Id: <20181226225501.151365-15-sashal@kernel.org>
Date:   Wed, 26 Dec 2018 17:54:53 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     stable@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Trond Myklebust <trond.myklebust@...merspace.com>,
        Sasha Levin <sashal@...nel.org>, linux-nfs@...r.kernel.org,
        netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 4.4 15/21] SUNRPC: Fix a race with XPRT_CONNECTING

From: Trond Myklebust <trond.myklebust@...merspace.com>

[ Upstream commit cf76785d30712d90185455e752337acdb53d2a5d ]

Ensure that we clear XPRT_CONNECTING before releasing the XPRT_LOCK so that
we don't have races between the (asynchronous) socket setup code and
tasks in xprt_connect().

Signed-off-by: Trond Myklebust <trond.myklebust@...merspace.com>
Tested-by: Chuck Lever <chuck.lever@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/sunrpc/xprtsock.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index c9c0976d3bbb..5047c20f4306 100644
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -2200,8 +2200,8 @@ static void xs_udp_setup_socket(struct work_struct *work)
 	trace_rpc_socket_connect(xprt, sock, 0);
 	status = 0;
 out:
-	xprt_unlock_connect(xprt, transport);
 	xprt_clear_connecting(xprt);
+	xprt_unlock_connect(xprt, transport);
 	xprt_wake_pending_tasks(xprt, status);
 }
 
@@ -2374,8 +2374,8 @@ static void xs_tcp_setup_socket(struct work_struct *work)
 	}
 	status = -EAGAIN;
 out:
-	xprt_unlock_connect(xprt, transport);
 	xprt_clear_connecting(xprt);
+	xprt_unlock_connect(xprt, transport);
 	xprt_wake_pending_tasks(xprt, status);
 }
 
-- 
2.19.1