From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Trond Myklebust <trond.myklebust@hammerspace.com>,
Sasha Levin <sashal@kernel.org>,
linux-nfs@vger.kernel.org, netdev@vger.kernel.org
Subject: [PATCH AUTOSEL 4.19 27/73] SUNRPC: Fix a potential race in xprt_connect()
Date: Wed, 12 Dec 2018 23:27:52 -0500 [thread overview]
Message-ID: <20181213042838.75160-27-sashal@kernel.org> (raw)
In-Reply-To: <20181213042838.75160-1-sashal@kernel.org>
From: Trond Myklebust <trond.myklebust@hammerspace.com>
[ Upstream commit 0a9a4304f3614e25d9de9b63502ca633c01c0d70 ]
If an asynchronous connection attempt completes while another task is
in xprt_connect(), then the call to rpc_sleep_on() could end up
racing with the call to xprt_wake_pending_tasks().
So add a second test of the connection state after we've put the
task to sleep and set the XPRT_CONNECTING flag, when we know that there
can be no asynchronous connection attempts still in progress.
Fixes: 0b9e79431377d ("SUNRPC: Move the test for XPRT_CONNECTING into...")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/sunrpc/xprt.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c
index a8db2e3f8904..d066aae3cb6d 100644
--- a/net/sunrpc/xprt.c
+++ b/net/sunrpc/xprt.c
@@ -781,8 +781,15 @@ void xprt_connect(struct rpc_task *task)
return;
if (xprt_test_and_set_connecting(xprt))
return;
- xprt->stat.connect_start = jiffies;
- xprt->ops->connect(xprt, task);
+ /* Race breaker */
+ if (!xprt_connected(xprt)) {
+ xprt->stat.connect_start = jiffies;
+ xprt->ops->connect(xprt, task);
+ } else {
+ xprt_clear_connecting(xprt);
+ task->tk_status = 0;
+ rpc_wake_up_queued_task(&xprt->pending, task);
+ }
}
xprt_release_write(xprt, task);
}
--
2.19.1
prev parent reply other threads:[~2018-12-13 4:50 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20181213042838.75160-1-sashal@kernel.org>
2018-12-13 4:27 ` [PATCH AUTOSEL 4.19 25/73] nfs: don't dirty kernel pages read by direct-io Sasha Levin
2018-12-13 4:27 ` [PATCH AUTOSEL 4.19 26/73] SUNRPC: Fix leak of krb5p encode pages Sasha Levin
2018-12-13 4:27 ` Sasha Levin [this message]
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