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authorTrond Myklebust <Trond.Myklebust@netapp.com>2012-10-23 17:50:07 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-10-31 09:51:34 -0700
commit910e425b29da7b601a99f49e81da666ab8ed5920 (patch)
treec98b00dcaa20d838361c297aa1a6b58b7ccc59e1
parent16b7109680b1a0c8b3ea6271645c5853f0ffaa3f (diff)
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SUNRPC: Prevent races in xs_abort_connection()
commit 4bc1e68ed6a8b59be8a79eb719be515a55c7bc68 upstream. The call to xprt_disconnect_done() that is triggered by a successful connection reset will trigger another automatic wakeup of all tasks on the xprt->pending rpc_wait_queue. In particular it will cause an early wake up of the task that called xprt_connect(). All we really want to do here is clear all the socket-specific state flags, so we split that functionality out of xs_sock_mark_closed() into a helper that can be called by xs_abort_connection() Reported-by: Chris Perl <chris.perl@gmail.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> Tested-by: Chris Perl <chris.perl@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--net/sunrpc/xprtsock.c13
1 files changed, 8 insertions, 5 deletions
diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index 2b17766..2202a14 100644
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -1449,7 +1449,7 @@ static void xs_tcp_cancel_linger_timeout(struct rpc_xprt *xprt)
xprt_clear_connecting(xprt);
}
-static void xs_sock_mark_closed(struct rpc_xprt *xprt)
+static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
{
smp_mb__before_clear_bit();
clear_bit(XPRT_CONNECTION_ABORT, &xprt->state);
@@ -1457,6 +1457,11 @@ static void xs_sock_mark_closed(struct rpc_xprt *xprt)
clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
clear_bit(XPRT_CLOSING, &xprt->state);
smp_mb__after_clear_bit();
+}
+
+static void xs_sock_mark_closed(struct rpc_xprt *xprt)
+{
+ xs_sock_reset_connection_flags(xprt);
/* Mark transport as closed and wake up all pending tasks */
xprt_disconnect_done(xprt);
}
@@ -1991,10 +1996,8 @@ static void xs_abort_connection(struct sock_xprt *transport)
any.sa_family = AF_UNSPEC;
result = kernel_connect(transport->sock, &any, sizeof(any), 0);
if (!result)
- xs_sock_mark_closed(&transport->xprt);
- else
- dprintk("RPC: AF_UNSPEC connect return code %d\n",
- result);
+ xs_sock_reset_connection_flags(&transport->xprt);
+ dprintk("RPC: AF_UNSPEC connect return code %d\n", result);
}
static void xs_tcp_reuse_connection(struct sock_xprt *transport)